ERROR MESSAGE "no account associated with this email address"

I have had a zoom account for over six year that has had the sign-in email address NISHISKSI@THRIVENOWNUTRITION.COM

Today I tried to sign-in and got a message that the email account is not registered. As a result of this issue, I am not able to access the account. The email address is still active and I receive emails from zoom regularly.

How can I regain access to my account and get the recorded videos?