This is not cool, colbyknox. No Facetime means no fun. Let’s get some additional information. When was the last time you were able to Facetime this particular contact? Have you installed/updated any particular application/software lately? What iOS version is installed on your phone?
First step to resolve wold be to ensure that this particular contact has not blocked your number accidentally: https://support.apple.com/en-us/HT201229
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