A Microsoft file hosting and synchronization service.
Dear Naruemon Nakmueng,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, please don’t worry, we can work together to narrow down and resolve the situation.
Here is article according to your error message for your reference; Error AADSTS50020 - User account from identity provider does not exist in tenant
As per your error message, could you please ask your organization admin to check if they have added you as a guest user or added you as a guest user from Azure Active Directory side. To check this: Go to Azure Active Directory portal > Users > Check you are added as a guest user or if you are not there, ask them to add your user account as Guest user and then check the result.
Meanwhile, could you please try to sign-in www.Office.com with your account and click on OneDrive icon to see if you are able to open OneDrive library in a browser or not, it will help for us to narrow your problem.
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
Sincerely,
Waqas Muhammad