Hello, Kaz023
Thanks for reaching out to our Microsoft Community Forum and please accept our warmest regards and sincerest hope that all is well.
We understand that you're experiencing issues with recording in Microsoft 365 apps on your iPhone. This issue could be caused by a number of factors, including a bug in the app or a problem with your device's microphone.
I hate to answer a request for help with another question, but can you please provide more details about the issue you're facing?
Also, are you attempting to transcribe recordings in Word? Refer to link below.
Or perhaps, add and record audio in PowerPoint? Refer to link below.
Your answers will help me formulate a solution that works for your issue and thus allowing us to resolve this a lot quicker.
Hope to hear from you soon.
Sincerely,
Glenn Rue
Moderator
Microsoft Community