Is my Android asian phone blacklisted?

I've experienced the same issue with my Xiaomi phones starting yesterday 6/4/24.  They were working on the prior day, but now cannot connect to mobile network.  

Xiaomi Redmi Note 11 5G

Xiaomi Redmi Note 9S
Xiaomi Redmi Note 7

Xiaomi Redmi Note 6 Pro
SIM cards were originally in the Note 11 5G and the Note 7, Swapped SIM cards into the other phones with all of them showing bars but no mobile data. 

Went to a T-mobile store and the rep said that the IMEI's were "locked to carrier" but was unable to see what carrier they were locked to. They replaced the SIM card on one of the phones and it didn't resolve the issue, also they placed the SIM card into a T-Mobile phone and it worked fine. 

Just some back info.  All phones were working prior to yesterday on T-mobile.  Phones were purchased at various times from different Amazon vendors. (months to years apart) 
Only mobile data does not work, they can make cellular calls to and from the phones when the SIM card is inserted. 

Side note, I kept one of the SIM cards in the Note 7 and data started working again, was able to run a test to speedtest.net and got 27.xx Mbps download.  Left it over night and in the morning I tried testing the SIM in another Xiaomi, now it doesn't work again in either the phone I put the SIM into OR the Note  7.  No mobile data but I can make and receive calls. 

Sorry for the thread hijack but I noticed the same issues.