Allow Calls on Other Devices is not working, but both my MacBook and my iPhone are synced in Apple ID and on FaceTime. From my MacBooks end, calls on other devices is active, but on my phone, it keeps giving me the same message. I did recently switch Apple IDs, so there may be something with this.
iPhone 12, iOS 15
An older article, but see if the troubleshooting helps.
Handoff Continuity Troubleshooting. -
iPhone, iPad, iPod touch, and Mac using Continuity - Connect. *
How to forward text messages on your iPhone. *
SMS Relay - Set up and use –Yosemite/ iOS 8. -
SMS Relay - Set up and use –Yosemite/ iOS 8 (2). -
Did you complete the mentioned steps in this article after changing your Apple ID on all of your devices?
What to do after you change your Apple ID or password - Apple Support
Allow Calls on Other Devices
