I'm British but now live in the USA. My iCloud account is set to American, my credit card and address is american, they have my American cell number on file, and my US cell number is associated with iMessage/iCloud.
But for some unknown reason, whenever I get group messages through on my iPhone or MacOS on Macbook Pro, instead of showing the names of the people involved, everyone's AMERICAN phone numbers show up but with the UK +44 international country code.....!!
Anyone know why this might be happening? I tried checking all the aforementioned details (my address, international settings, phone number etc) with Apple Help but they had no idea what might be going on.....??