Identity verification for xfinity mobile is not working

I’ve tried multiple times on multiple devices to activate my free phone line because of upgrading my internet. Each time I do, I get to the identity verification section and input my correct birthday and SSN. Every time it says it was unable to verify my identity. I tried to do it so many times that now all it says is “sorry”. It’s very frustrating that this doesn’t work. I’m trying to give my business to the company, but it refuses to work. I just want to get it figured out.