Have three accounts in one account

Hi Sarah

I have a similar issue as described in this question. Please can you elabortate on how to do this: “If there’s already an existing HubSpot portal for each company, you can easily send an invitation to join that HubSpot portal with the same address”. I am trying to give access to our HubSpot org to a marketing agency that manages our website and he already has an account with another client and he is struggling with 2FA. Thanks