Can't add requester login access email address

Can't add requester login access email address

Hi There,
I have a problem to add an email address to a requester to activate the web login for Self Service Access.
It comes an error message "IAMError:U123:User present in a different organization; remove this association to perform the action"
What does this means?
1. I have no other organisation
2. The email address is no where else in my SDP

Could it be taht the email is used in any other Zoho services which is outside of my control?

Thank you

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