call using iphone grayed out on mac facetime
Can't call or receive calls using iPhone from MacBook pro or iMac, "the call using iPhone" option in facebook is grayed out. The functionality works okay from the iPad. And it worked on the Macs until recently. I have logged out of iCloud and facebook on MacBook and re-logged in and nothing seems to change. Running Mojave 10.14.2. Had version 11 on iPhone, just updated to 12.1.2, doesn't make any difference.
MacBook Air (2018 or later)