Android Phone Not Receiving Text Messages After Switching to T-Mobile Network

If you ported in your number.  Verizon doesn't like to fully release the number er in hopes that the issues caused will bring you back to them.  In terms of SMS/MMS services, like 2FA with your bank and other things.  If they ask for the provider when you sign up for their 2FA service.  That means they are only sending those texts over that network and you will need to have them update their system. Have you tried asking those sending the texts to delete the message thread and create a new one to see if that fixes it?