What should be done if you receive an error message saying, "This person belongs to another account" while inviting someone?

When you encounter the error message stating, "This person belongs to another account" while attempting to invite someone, the appropriate action is to provide a different email address. This message indicates that the email address you are trying to use is already associated with a different Smartsheet account.

By changing the email address, you effectively circumvent the restriction that disallows inviting a user whose account is already linked to an existing account. This makes it possible for the individual to receive an invitation under a new address, allowing them to join your team or organization without conflicts or complications from the existing account association.

While other options might seem relevant, they do not address the issue directly associated with account ownership tied to the specific email address.