Seems reasonable. Maybe you can try flashing the stock tmobile firmware, check unlock status and then reflash lineage? Afaik, once unlocked, it stays permanently unlocked regardless of the rom.Here's a question. Purchased a T-Mobile Moto G7 Power on Ebay that was unlocked by previous owner. Installed Lineage OS and tried to use Tracfone AT&T compatible SIM but it would not recognize it. Only recognizes T-Mobile compatible SIM. Contacted Tracfone support and supplied IMEI and they said it's locked to T-Mobile. Contacted seller who swears he contacted T-mobile and they assured him it was unlocked before he sold it. He contacted T-Mobile again who told him that we must do the following, "Settings > More Connection Settings > Network Unlock > Permanent Unlock" But since I installed Lineage OS, I don't have those options, and my understanding is that those options are unique to T-Mobile's stock Android version. So is it possible for OP to help me unlock this phone or is it stuck on T-Mobile's towers for the rest of its days?
Hope that helps