We're using Firebase for our back end which requires either an email or phone number for the user. However, if you want to be sly you could just put in another

We're using Firebase for our back end which requires either an email or phone number for the user. However, if you want to be sly you could just put in another username in there and it should/could still work (don't hold me on that). Just means we can't contact you with email so push notifications are hopefully turned on.