connect and reject issue

[factblock-roy]

Hello, I'm an app developer. We're building a registration system using WalletConnect wallet addresses and signatures. I have several questions:

Regarding WalletConnect pairing, when connecting six different wallets, do we need to create six separate pairings, or can it be handled with a single pairing?
When a user rejects the pairing connection in MetaMask and returns to our app, then tries to launch MetaMask again by tapping the MetaMask button, there's no response. Is this a MetaMask issue or a WalletConnect issue?
After attempting to connect with MetaMask and then trying to connect with a different wallet, sometimes there's no response. With Trust Wallet, we need to attempt the connection twice before the connection prompt appears.
With Rainbow wallet, if a user rejects during the connect process and tries to connect again, issues occur resulting in failure.
Generally, the process of connect => personal sign works fine when approved, but when a user rejects during the connect process, we're curious about what exactly happens behind the scenes. Why don't these wallet apps respond properly, and what's actually occurring in these situations?
These issues are occurring at a significantly higher rate on Android.