Unlocked s21 Ultra showing as "Unknown Device" and not supporting 5G or Extended Range LTE on My Mobile account

Not having the IMEI number is a bad excuse. I had to give it to them when I switched my unlocked S20Ultra from Verizon to TMobile. They sent me a new sim card for my wife and I which she has an unlocked iPhone she bought from Apple directly and after we were activated, it shows mine as unknown and hers as an iphone but they were both unlocked BYOD coming from another carrier. So why can't they just manually input the number when you give it to them. Sounds like just laziness. BTW my phone works great. It's in the 5G and even though the coverage has bit or miss issues (which I confirmed they were working on the network in that area) everything works great except the visual voicemail. I still can't get the default disabled and just use the TMobile one as a standalone. A little annoying.