We have recently gone live with InTune, for all our iPhone devices. One major gripe the users have is that they can no longer copy phone numbers out of Outlook, or Teams. We have no need to restrict a phone number being copied. Is there a method to allow the copying of phone numbers? Note our devices are not in supervised mode.
I think you have configured mobile application policies and blocked that your users can copy and paste data.
Unfortunately you are very limited in the options. You cannot configure allow copy and paste for only phone numbers. You can only configure block all copy and paste actions or block copy and pasta to not managed apps like WhatsApp.