Due to infrastructure policies, the same email address cannot be used to create accounts in both regions at the same time. If you'd like to reuse your email in a different region, you must first delete your existing account.
If your account is registered in the US region and you’d like to connect a calendar using the same email address to an account in the EU region, the US account must be deleted first. Once it’s removed, you’ll be able to link that calendar email to your EU account.
