Unable to activate iPhone to my boost plan

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Unable to activate iPhone to my boost plan

I've been attempting to swap over my phones from my iPhone 6s to my iPhone SE and nothing seems to work. I've tried swapping it using the website and several times I've received the error "db_no_data_found_exception-Client.701:089792538303310214 is not found in NMS......Data not found". I'm 100% positive I'm entering the Serial Number/IMEI correctly and am clueless as to what to do. If anyone could help me out that'd be great! 🙂