Why is WiFi calling now "forbidden"?


    I recently purchased a new Motorola X4. Last week when I put in my sim everything seemed well. I was actually prompted that wifi calling was available and went to the settings and turned it on. It has worked at work and home until today. Now at home it WiFi calling will not connect and the phone reports the status as Forbidden.  My plan is simply prepaid with unlimited calls and text, 10GB of lte data. I seen in another post it is supposed to be included in prep and post paid plans so what is up?  Why am I forbidden now? 

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