iPhone says it's linked to an Apple ID which isn't mine
I have an old iPhone 5s that was swapped out by Apple Support in Melbourne in about 2016 due to problems with my new phone. I used it for a couple of years but then upgraded, I am now trying to use it just for music but when attempting to activate the phone it says it is linked to an Apple ID which isn't mine? I tried my Apple ID and it says not correct but I have only ever had one Apple ID. Is the partially redacted email address showing on the screen the ID they are looking for as it shows "r........@msn.com" and I have never had an msn email account? Thank you.
[Re-Titled by Moderator]