How to turn off notifications when using FaceTime

Hello.

My question is: how do I stop notifications while I am using FaceTime?

Description: When I am on FaceTime I get interruptions from notifications. It might be a phone call, it might be a reminder, it might be an app. I want to be able to turn these off while I am on FaceTime so that they don’t interrupt my FaceTime calls.

Specifics: 

• I have an iPhone 13 pro with iOS 15.5
• In Settings-Focus-Do Not Disturb, in the Allowed Notifications, People box: I have just the contact that I want to allow.

     In the Apps box I just 

     have Messenger. There 

     is no option for adding 

     FaceTime.

     Down under Turn On 

     Automatically, I have the

     FaceTime app set to On  

     so that Do not Disturb 

     will be turned on when 

     using FaceTime and go 

     off when not on 

     FaceTime.

• With these settings, I cannot receive the call from my contact. I have to turn Do Not Disturb back off, then I get all of the notifications.

Possible Fix: Take Messenger off of the allowable apps. I think that I have tried this before but I will try it again.

Any thoughts on how to block all of the notifications when on FaceTime?