I'm using Microsoft Authenticator. I have doubt that this is related to the ios update. I just rolled back my ios to 14.6 and issue the same.
I wonder there is another option available like SMS in case of a lost or damaged phone.
I did upgrade my IOS to ios 15, don't know if this affects adguard 2fa ! when trying to access my adguard , the 2fa code is not working. can you help me plz. my account is the same as this email and I can receive SMS to the registered mobile if possible.