why can I no longer answer or make a call from one of my contacts?

I just got a moto z play and I have never had a smart phone of any kind. I tried to make a call to one of my contacts and they didn't answer, they called me right back and I couldn't answer. Not sure what I might have pushed but now my phone will show an incoming call from her but I can't answer and when I try and call her back it won't let her answer on her side.

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