I was having the same issue as well with my Moto Z2Play but solved it like this: I went into Android settings, Data Usage, Data Saver (which is Off). I selected Unrestricted Data Access, which opened a list of apps on the phone that are allowed unrestricted data access. I scrolled down to Connect, selected On. I returned to Data Saver, which still says Off because only a few apps on the phone have unrestricted data access. When I returned to Connect, the green dot next to my phone number had returned. I can now make and receive phone calls using Connect.
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