I am experiencing the same with iOS 17. Were you able to resolve this?

I ran into this issue with iOS 17 devices - If the call was answered from the Lock Screen, the video button is disabled. Is this your experience also?

When the "Enable Dictation?" alert is displayed, appDelegate.applicationWillResignActive() is called. My guess is that in this method, you are force-ending the editing of the text input (via endEditing(), resignFirstResponder(), etc.) which is making the need for dictation permission no longer necessary.