It depends on what you mean by "support". Will it work? (i.e. Does the 7.1 support T-Mobile?) The answer to this question is, "Maybe". I've seen different lists of bands. Some say it does, some say it doesn't. I'm pretty sure it doesn't have band 71, so that's a pretty big strike against it.
Last year HMD Global (a.k.a. Nokia) submitted several phones to the FCC for approval. They were called the TA-1112, TA-1093, TA-1081, TA-1120, TA-1016, TA-1074, TA-1084, TA1124 & TA-1136. It's not clear if any of these were the 7.1 since the model number used for sales does not appear in the approval documents.
If you mean, "Will T-Mobile support me if I have a problem with the phone?" The answer is, "Not very much." T-Mobile only "supports" the use of the phones they sell. For everything else, you're on your own.