I'm facing the same issue above where I can not create a new account because I already have an account registered with the same email. Any suggestions?
It's easy to set up a new HubSpot Portal with the same email address. Or, if there's an existing HubSpot Portal you can send an inivtation to join that HubSpot Portal with the same email address.
Then, you'll have access to an account switcher on the top right menu (below profile and preferences).