I am activation a mobile internet sim kit in iPad thru tmobile cellular data account screen, but get an error, you selected is not associated

jovvan

    I am activatino a mobile internet sim kit in iPad thru tmobile cellular data screen, but get an error, account you selected is not associated ...it won't let me activate the sim.......I already hv a ph & another iPad on the one plan....what is wrong, how do I fix the issue, tried multiple times, but same error

     

    in the add new line screen, in iPad general settings, after login, I made sure it's my account number which is listed...& account number is correct

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