Why can't I answer incoming phone calls on my Pixel?

Whenever I get a phone call on my Pixel, my phone will ring but I can't answer the call. My phone acts normal when I'm getting a phone call, by normal I mean the way it would act as if I wasn't getting a call. Then my phone will tell me I had a missed call. The only thing I've noticed on my screen that is different is that I have a phone icon on the top right hand side of my screen next to my wifi icon. I'm not sure what the icon means or why it is there.

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