I disconnected my Spotify a/c from Facebook.
I realize I can't change my numeric userid, but I read on a Spotify help page that I should be able to log in using my email, not my numeric userid, which is long and hard to remember.
But every time I log into my account on my mac, it will only let me log in if I provide the numeric userid, not if I provide my email. See pic attached.
Page link below and the advice it gives:
My plan details, etc below: