Apple One on EE Plan issues

I'm trying to use Apple One with my EE plan. But it's telling me it's not available in my country or region

I've gone through every step imaginable. Spoken to Apple. They tell me it's an EE issue... Spoken to EE they are telling me it's an Apple issue and possibly something needs to be reset on my Apple ID.

I've exhausted every single option I can think of.... Has anyone ever had an issue like this before?!