Cannot access Mobile Data on Tello; APN setting access denied

[ConSider]

Unable to Access Data Network on Tello (T-Mobile) No Access to APN Frustrated

I got a Tello eSIM today and I had the same issue: voice calls were fine but could not get mobile data. (FYI, I am running Iode OS version 6.6 instead of version 6.3 that the Brax3 shipped with, but I doubt that has anything to do with the issue or its resolution.) I was able to resolve the issue by following these two steps (your mileage may vary): I performed a factory reset (search for factory reset in settings). At least in my case, this operation preserved the Tello eSIM configuration I s…

Other Brax users were able to resolve their issues using this information.