Sorry for any frustration. I see that support has been in contact with you and provided the steps, but for anyone else:
A user can only be part of one business account at a time, so they need to be removed (not deleted), from the current account and then invited to join the new account.
Before this happens the user should remove any sites they have shared from the shared folders and then delete the shared folder itself. They can create a new shared folder once they have been successfully added to the new account.
Glenn is a member of the LogMeIn Community Care Team.
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