Cannot Join Our Organization, because i was already registered before the invintation was sent.

Cannot Join Our Organization, because i was already registered before the invintation was sent.

Hello i am facing an issue with login into my organization.
I created account before i got my organization invite.
Now I have it but I cannot register into because my account is already exist but without organization.
Err message: An account already exists with this email address in the eu DC. Please contact support@zohoaccounts.com for further assistance.