iPhone activation issue

So I went to get my carrier switch over from T-Mobile to Metro PCS and in the mist of me going through the process they said my phone couldn’t be activated because it was reported stolen and had a lock I don’t understand because I was partnered with metro pack in the past and I bought my phone from the app offer up but I never had any issues with it until today I had my phone going on 2 years so I’m just upset because I really my phone activated.

[Edited by Moderator]