Hi @Amanda10997
If you are trying to change a registrant's email address to an address that matches a contact record we recommend to cancel the registrant with the old address and process the registration with the new address. The good news is you can use the Register Someone link to re-register this person with the right address. If there is payment tied to the old registration and you do not want the registrant to pay again, skip the payment process so that the registrant is abandoned, then mark the registrant as registered and paid.
We apologize for any inconvenience caused from not being able to update a registrant's email address to an email address that's already in use. It is however at this time, we do not have plans to include this type of functionality due to the low number of tracks from other customers and the prioritization of other ideas. If we hear anything in the future regarding this feature request, we will update the thread.
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