Can a requester blong to multiple sites?

Can a requester blong to multiple sites?

 I have the sites setup with about 5 diffrent sites. I have a requester who may need to enter a ticket on 2 or 3 of the sites. I have not seen a way to add the a 2nd or third site to a requester. I am thinking I will need to add a login for that user for all 3 sites.

Any help on this would be great thank you.

John

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