How do I add wifi printer to T-Mobile router WITHOUT the invasive data mining of the T-Life app?

Disgruntled T-Mob Customer wrote:

All of my devices besides the wi-fi printer in question run iOS or MacOS (not Windows, Google or whatever).  That said up front, how do I go about adding a wi-fi printer to my T-Mobile Home Internet WITHOUT downloading and using their data mining tool they like to call "T-Mobile Life"?  There's not a chance in any I'll allow T-Mobile access to my contacts.

You have to use the app if you want it to directly connect to the T-Mobile gateway via wireless.  There is no other way unless you have a GrapheneOS device where those permissions can be rejected and the app fully sandboxed so even if you gave it contacts permissions, it wouldn't see them anyway.