I keep getting a SIM not supported error when trying to activate

My iphone SE is unlocked and the software is up to date but I cannot active my new SIM card on my phone. I have tried the SIM it in another iphone and it seems to work fine. Please help! This is my primary work and personal line and having no service all evening is very stressful. I am regretting my decision to switch to Fizz.
Thanks for any help you can provide.


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