I have been having an ongoing issue with messages (mms) being sent to my Pixel XL 2 device. MMS Messages received from people, both one person or in a group chat have phone numbers in the format of number/TYPE=PLMN@tmomail.net. I have narrowed this to the original sender of the message in a group chat by several tests. This problem happens regardless of the contact being stored in my phone or not. I have hard reset my phone, contacted Tmo support by phone, etc. and no resolution. Any assistance would be greatly appreciated.
Best answer by tomthebom
Newest update of messages seems to have solved the problem. Cautiously optimistic.