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Microsoft Security | Microsoft Entra | Microsoft Entra External ID
Managing external identities to enable secure access for partners, customers, and other non-employees
Hey there, Storm Maddern
With limited information, I am making the assumption you are meaning B2B accounts on Microsoft Entra. If so, yes, you can convert an internal account to an external account again. Please can you sign into the Entra ID blade here: https://portal.azure.com/#view/Microsoft_AAD_UsersAndTenants/UserManagementMenuBlade/~/AllUsers
Once you have signed in, please click onto your account you wish to convert back to an external user. Once the profile opens, please click onto the link "Convert to external user" under B2B invitation.
Then follow the instructions to convert them back to a B2B user.
Please be aware that you will need to accept the invitation again to be added back as a guest. Once you accept that notification, you will be able to use the tenant as a guest on that account.
For more information about this, please visit this article: https://learn.microsoft.com/en-us/entra/external-id/user-properties#convert-usertype
Hope this helps,
Nathan