Guys, i will strongly recommend a factory reset after upgrading from Android 10 to 11 to remove any possible causes of issues related to the update
I will usually recommend a full clean reset especially upgrading from 1 android version to another as this is a major jump in version and oneplus did a major revamp on their UI
My volte gone after factory reset.
Gpay not working on public transport also.
Really regret and wasted a lot of time for nothing....