Hi @Gudy74
To the best of my knowledge this might be due contacts being able to have additional emails, but these emails are not searchable from within the UX. When you search for the email that is allegedly in the system, do any contacts get suggested? Or does the search come up empty?
I just did a test in my demo portal, added a random email to an existing contact.
This still returns/suggests the right contact.
Alternatively, have you tried creating a new contact from scratch with the email that HubSpot is telling you already exists? This actually also tells you which contact already has that email:
Let me know if that gets you somewhere.
Frank