iMessage and FaceTime only works on iPhone and not my other devices

Hi,

Pulling my hair out with this one. A few weeks ago my FaceTime and iMessage apps stopped working on my devices apart from my iPhone 12 Pro.

The devices I have is a 2019 iMac

iPad Pro 2nd gen

A new MacBook Air M3

Even when I set up the MacBook Air out of the box. I still couldn't use FaceTime or iMessages.

I am asked to log in every time I open the apps, on FaceTime I am unable to make a call and the recipients name has a pale green look as though it is disabled.

When I open iMessage, I start typing a message and then locks me out after a few second and I have to sign back in again.

This happens on all my devices on my wifi apart from my iPhone.

I have tried all the solutions I can find but with no luck.

Is there anyone that can help me with this problem?