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

I've got the same problem as I have in the past. 

Just to clarify we're talking about official  USA Samsung T-Mobile devices purchased in the USA from vendors other than T-Mobile directly and not dual sim international Samsung devices.

I purchased a T-Mobile Samsung S21U from Best Buy USA. It is not recognized by T-Mobile because the IMEI number is not in their system. 

Now this is a major problem for me because the IMEI needs to be in T-Mobiles system for a sim unlock request to be fulfilled. 

I had a similar issue in the past with T-Mobile Samsung devices bought from Samsung directly. T-Mobile claim they can't sim unlock the device because it's not in their system.  

I have already contacted T-Force via Twitter but have been told to wait at least 14 days to get a response. We'll see.