If you ever come across the fact that the address info in Office 365 does not reflect your AD in respect to the country then the subject probably tells you what to do.

We don’t have many but there are international moves that occur within the company. Not that long ago somebody attended us that their country information on the Office 365 portal didn’t match. This whilst his on premise information within Active Directory did.

It seems like the value that is used via Azure AD Connect is the value present in ‘co’ within Active Directory. When using the normal management tools if the value in the directory got updated it would change both ‘c’ as well as ‘co’ entries (both represent ‘country’). However if updates occur via scripting in Powershell if the value of ‘c’ got updated, the value of ‘co’ remained the same. So if you come across this you probably have an automation running somewhere as did we that changes address information when needed make sure you update both.