Authenticator - Push Notifications stopped working

A few days ago, the Authenticator stopped iniciate push notifications. Authentication works well, but after login in and wait for a push notification, nothing happens on my phone. I must open the Authenticator app and then tap on Approve button.
A few days ago, everything worked without a problem.

iPhone 11 Pro
iOS 15.1 (latest, updated ~1 month ago)

Reinstalling the Authenticator … did not help
Re-adding the Authenticator to the account … did not help

Does anyone have the same problem?
Or have any idea how to fix the problem?
Thank you

no fix, it’s always bugged on iphones…