I have had a Spotify Free account for several years - unused. Yesterday, I upgraded this to Premium Family. This account has a sensible username and requires it to log in - it will not let me use the email address.
My wife signed up to join our Family subscription but was not given any choice of username: she was assigned an insanely complex ~20 character thing which is impossible to remember. She can however login with her e-mail address.
Why the inconsistency? I'd much rather sign in with my email address.
The username is quoted everywhere - in the Android app for example - which, for my wife, means half her screen is taken up by her username. Asking Spotify Help for Change Username tells us there is a Profile Name which can be customised...but there isn't.
How can I standardise username behaviour?