Hi, MYOBuser2021. Thank you for posting here in the Community Forum.
If you have Administrator access to MYOB, you can invite anyone you'd like to sign in to your MYOB business. If you need a hand with your books, you can Invite your accountant or bookkeeper. To investigate the error you're encountering, please verify the last four digits of the serial number you're referring to and confirm the last name of the business owner. This information will significantly aid us in addressing this issue.
We are looking forward to assisting you.
Best regards,
Hannah