Unable to update account address after company locked domain

Hi,

I am trying to update my work account address after the company I work with locked their domain. However, when I try to login to my account, I keep getting the below, both when I try it from my MacBook, as well as when I try to login online. As an administrator, I cannot add another country that would be supported on our ABM.

Can I get some help with this? We have a deadline of 25 days to sort this out, and would not like to have to shift this to a personal account and re-start another work account from scratch.