Duplicate SIM for Non-Primary Line


    I have a secondary phone on my account that the user would like to test with a secondary sim. How do I go about getting that added? When I login to do it, I can't see his line in the registration though it is on my account and I can see it on My T-Mobile and when he logs in to register, it says he can't do that option as he is not primary. Thoughts? Thanks.

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