ZT blocking all traffic on T-Mobile 5G

ZT on Android Pixel 5a phone works fine when connected to internet via wifi/home ISP, but when I turn wifi connection off and phone connects to internet via only T-Mobile 5G network (as when outside my home), instantly there is no ability to visit any web site at all. Literally, no connection. What’s incompatible here and what can I do to fix it?

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