Hi Laanister
and welcome to this Apple (user-to-user) Community!
Re: iMessage and FaceTime are deactivated on iPhone and Mac
Thank you kindly for including what you have tried already.
As well, there are various other possible causes and solutions to the situation:
To find the solution in your case, please check through Apple Support's trouble-shooting articles below:
______________
On your iPhone: See what to do:
If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support
___________
On your Mac: See what to do:
If you can’t send or receive messages using Messages on Mac - Apple Support
and / or
If you can’t turn on or sign in to iMessage or FaceTime on iPad, Mac, or Apple Vision Pro - Apple Support
If you still need help:
Please feel free to send us a reply,
or
If needed:
The Apple Messages Support website has info. / support / contact options etc.
Messages for iPhone, iPad, Apple Watch, and Mac - Official Apple Support
All the best :-)