re-enabling wifi calling

Hi all. For some reason, the Mac will suddenly ask me to authenticate wifi calling again in Facetime. This happens when the computer goes to sleep and I open it. It doesn't do this consistently. Has anyone had this? I mean I just have to hit "OK" and the dialog goes away. I'm just mildly curious and a bit annoyed when it comes up. i haven't changed passwords or anything like that.

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