diff --git a/Btchap/Config/BuildSettings.swift b/Btchap/Config/BuildSettings.swift
index d873f79d1..0fffd896e 100644
--- a/Btchap/Config/BuildSettings.swift
+++ b/Btchap/Config/BuildSettings.swift
@@ -124,6 +124,7 @@ final class BuildSettings: NSObject {
     static let applicationServicesStatusUrlString = "https://status.tchap.numerique.gouv.fr/"
     static let applicationAcceptableUsePolicyUrlString = ""
     static let proConnectInfoUrlString = "https://proconnect.gouv.fr/"
+    static let proConnectAvailabilityFaqArticleUrlString = "https://aide.tchap.beta.gouv.fr/fr/article/se-connecter-a-tchap-avec-proconnect-1dh1peg"
 
     // MARK: - Matrix permalinks
     // Hosts/Paths for URLs that will considered as valid permalinks. Those permalinks are opened within the app.
@@ -244,7 +245,7 @@ final class BuildSettings: NSObject {
     ]
     
     // Tchap: handle SSO feature flag. Presents SSO button on Onboarding screen and give priority to SSO on UIA.
-    static let tchapFeatureHandleSSO = false
+    static let tchapFeatureHandleSSO = true
     
     // MARK: - Side Menu
     static let enableSideMenu: Bool = true && !newAppLayoutEnabled
diff --git a/DevTchap/Config/BuildSettings.swift b/DevTchap/Config/BuildSettings.swift
index 3b0e39924..5e5881deb 100644
--- a/DevTchap/Config/BuildSettings.swift
+++ b/DevTchap/Config/BuildSettings.swift
@@ -124,7 +124,8 @@ final class BuildSettings: NSObject {
     static let applicationServicesStatusUrlString = "https://status.tchap.numerique.gouv.fr/"
     static let applicationAcceptableUsePolicyUrlString = ""
     static let proConnectInfoUrlString = "https://proconnect.gouv.fr/"
-    
+    static let proConnectAvailabilityFaqArticleUrlString = "https://aide.tchap.beta.gouv.fr/fr/article/se-connecter-a-tchap-avec-proconnect-1dh1peg"
+
     // MARK: - Matrix permalinks
     // Hosts/Paths for URLs that will considered as valid permalinks. Those permalinks are opened within the app.
     static let permalinkSupportedHosts: [String: [String]] = [
diff --git a/Tchap/Assets/Localizations/fr.lproj/Tchap.strings b/Tchap/Assets/Localizations/fr.lproj/Tchap.strings
index 6b9f02806..8ac288a11 100644
--- a/Tchap/Assets/Localizations/fr.lproj/Tchap.strings
+++ b/Tchap/Assets/Localizations/fr.lproj/Tchap.strings
@@ -42,6 +42,8 @@
 "authentication_error_limit_exceeded" = "Vos trois dernières tentatives de connexion ont échoué. Veuillez réessayer dans 30 minutes";
 "authentication_choose_password_signout_all_devices" = "Déconnecter mes appareils et verrouiller mes messages (en cas de piratage de votre compte ou de la perte d'un appareil)";
 
+"authentication_sso_warning" = "→ Est-ce que ProConnect est activé pour mon administration ?";
+
 ////////////////////////////////////////////////////////////////////////////////
 // MARK: Forgot password
 "forgot_password_title" = "Connexion Tchap";
diff --git a/Tchap/Config/BuildSettings.swift b/Tchap/Config/BuildSettings.swift
index cba961d82..6f946c1dc 100644
--- a/Tchap/Config/BuildSettings.swift
+++ b/Tchap/Config/BuildSettings.swift
@@ -138,7 +138,8 @@ final class BuildSettings: NSObject {
     static let applicationServicesStatusUrlString = "https://status.tchap.numerique.gouv.fr/"
     static let applicationAcceptableUsePolicyUrlString = ""
     static let proConnectInfoUrlString = "https://proconnect.gouv.fr/"
-    
+    static let proConnectAvailabilityFaqArticleUrlString = "https://aide.tchap.beta.gouv.fr/fr/article/se-connecter-a-tchap-avec-proconnect-1dh1peg"
+
     // MARK: - Matrix permalinks
     // Hosts/Paths for URLs that will considered as valid permalinks. Those permalinks are opened within the app.
     static let permalinkSupportedHosts: [String: [String]] = [
diff --git a/Tchap/Extensions/WebLinks+Tchap.swift b/Tchap/Extensions/WebLinks+Tchap.swift
index 38bc858ac..ce7cb4602 100644
--- a/Tchap/Extensions/WebLinks+Tchap.swift
+++ b/Tchap/Extensions/WebLinks+Tchap.swift
@@ -20,10 +20,6 @@ import Foundation
 // becasue UIApplication.shared is not available for extension.
 @available(iOSApplicationExtension, unavailable)
 struct TchapWebLinks {
-    static func openProConnectInfo() {
-        self.openWebsite(urlString: BuildSettings.proConnectInfoUrlString)
-    }
-    
     static private func openWebsite(urlString: String) {
         guard let websiteUrl = URL(string: urlString) else {
             return
diff --git a/Tchap/Modules/Authentication/Login/View/TchapAuthenticationLoginScreen.swift b/Tchap/Modules/Authentication/Login/View/TchapAuthenticationLoginScreen.swift
index e45c9347f..20f37d047 100644
--- a/Tchap/Modules/Authentication/Login/View/TchapAuthenticationLoginScreen.swift
+++ b/Tchap/Modules/Authentication/Login/View/TchapAuthenticationLoginScreen.swift
@@ -26,7 +26,9 @@ struct TchapAuthenticationLoginScreen: View {
     /// A boolean that can be toggled to give focus to the password text field.
     /// This must be manually set back to `false` when the text field finishes editing.
     @State private var isPasswordFocused = false
-        
+    @State private var presentProConnectInfo = false
+    @State private var presentProConnectAvailabilityFaqArticle = false
+
     // MARK: Public
     
     @ObservedObject var viewModel: AuthenticationLoginViewModel.Context
@@ -50,6 +52,12 @@ struct TchapAuthenticationLoginScreen: View {
         .background(theme.colors.background.ignoresSafeArea())
         .alert(item: $viewModel.alertInfo) { $0.alert }
         .accentColor(theme.colors.accent)
+        .sheet(isPresented: $presentProConnectAvailabilityFaqArticle) {
+            WebSheetView(targetUrl: URL(string: BuildSettings.proConnectAvailabilityFaqArticleUrlString)!)
+        }
+        .sheet(isPresented: $presentProConnectInfo) {
+            WebSheetView(targetUrl: URL(string: BuildSettings.proConnectInfoUrlString)!)
+        }
     }
     
     /// The header containing a Welcome Back title.
@@ -91,6 +99,8 @@ struct TchapAuthenticationLoginScreen: View {
                 passwordLoginSection
             } else if case .sso = viewModel.viewState.tchapAuthenticationMode {
                 ssoLoginSection
+                Spacer(minLength: 32.0)
+                ssoInformation
             }
         }
     }
@@ -148,6 +158,13 @@ struct TchapAuthenticationLoginScreen: View {
         }
     }
     
+    var ssoInformation: some View {
+        Button(action: { openProConnectAvailabilityFaqArticle() }, label: {
+            Text(TchapL10n.authenticationSsoWarning)
+        })
+        .padding(.horizontal, 16.0)
+    }
+    
     /// Parses the username for a homeserver.
     func usernameEditingChanged(isEditing: Bool) {
         guard !isEditing, !viewModel.username.isEmpty else { return }
@@ -231,7 +248,11 @@ struct TchapAuthenticationLoginScreen: View {
     }
 
     func openProConnectWebsite() {
-        TchapWebLinks.openProConnectInfo()
+        presentProConnectInfo = true
+    }
+
+    func openProConnectAvailabilityFaqArticle() {
+        presentProConnectAvailabilityFaqArticle = true
     }
 }
 
diff --git a/Tchap/Modules/Onboarding/SplashScreen/View/TchapOnboardingSplashScreen.swift b/Tchap/Modules/Onboarding/SplashScreen/View/TchapOnboardingSplashScreen.swift
index f936b0567..9778ece9a 100644
--- a/Tchap/Modules/Onboarding/SplashScreen/View/TchapOnboardingSplashScreen.swift
+++ b/Tchap/Modules/Onboarding/SplashScreen/View/TchapOnboardingSplashScreen.swift
@@ -30,6 +30,7 @@ struct TchapOnboardingSplashScreen: View {
     @ObservedObject var viewModel: OnboardingSplashScreenViewModel.Context
     
     @State var appTheme = ThemeService.shared()
+    @State var presentProConnectInfo = false
     
     var body: some View {
         GeometryReader { geometry in
@@ -59,6 +60,10 @@ struct TchapOnboardingSplashScreen: View {
         .accentColor(theme.colors.accent)
         .navigationBarHidden(true)
         .track(screen: .welcome)
+        .sheet(isPresented: $presentProConnectInfo) {
+            WebSheetView(targetUrl: URL(string: BuildSettings.proConnectInfoUrlString)!)
+        }
+
     }
     
     var header: some View {
@@ -166,7 +171,7 @@ struct TchapOnboardingSplashScreen: View {
     }
 
     func openProConnectWebsite() {
-        TchapWebLinks.openProConnectInfo()
+        presentProConnectInfo = true
     }
 }
 
diff --git a/Tchap/Modules/WebSheet/WebSheetViewController.swift b/Tchap/Modules/WebSheet/WebSheetViewController.swift
index 347b522c1..857186fd5 100644
--- a/Tchap/Modules/WebSheet/WebSheetViewController.swift
+++ b/Tchap/Modules/WebSheet/WebSheetViewController.swift
@@ -195,3 +195,20 @@ extension WebSheetViewController: WKNavigationDelegate {
         // Called when the web view’s web content process is terminated.
     }
 }
+
+import SwiftUI
+
+struct WebSheetView: UIViewControllerRepresentable {
+    typealias UIViewControllerType = WebSheetViewController
+    let targetUrl: URL
+    
+    func makeUIViewController(context: Context) -> WebSheetViewController {
+        let vc = WebSheetViewController(targetUrl: targetUrl)
+        // Do some configurations here if needed.
+        return vc
+    }
+    
+    func updateUIViewController(_ uiViewController: WebSheetViewController, context: Context) {
+        // Updates the state of the specified view controller with new information from SwiftUI.
+    }
+}
diff --git a/changelog.d/1100.change b/changelog.d/1100.change
new file mode 100644
index 000000000..46c61dc93
--- /dev/null
+++ b/changelog.d/1100.change
@@ -0,0 +1 @@
+ProConnect - Message d'avertissement et lien vers la FAQ à propos de la disponibilité du service ProConnect sur tous les HomeServers
\ No newline at end of file