Hello @Andreas Flügge ,
I understand that you want to remove personal Microsoft account which was associated with an organization.
You can usually leave an organization on your own without having to contact an administrator. However, in some cases this option won't be available, and you'll need to contact your tenant admin, who can delete your account in the external organization.
You can follow the below mentioned follow steps:
- As you are using the personal account,you'll need to use a My Account URL that includes your tenant name or tenant ID.For example:
https://myaccount.microsoft.com?tenantId=contoso.onmicrosoft.com
-or-https://myaccount.microsoft.com?tenantId=aaaabbbb-0000-cccc-1111-dddd2222eeee
You might need to open this URL in a private browser session.
NOTE: In place of tenantID= give your tenantid - Select Organizations from the left navigation pane or select the Manage organizations link from the Organizations block.
- The Organizations page appears, where you can view and manage the organizations you belong to.
- Now under Other organizations you collaborate with (or Organizations if you don't have a home organization), find the organization that you want to leave, and then select Leave.
- If you select Leave for an organization but you see the following message, it means you’ll need to contact the organization's admin, or privacy contact and ask them to remove you from their organization.
NOTE: If you're unable to remove yourself from an organization, you'll need to contact the organization's admin to have them remove you.
For detailed information you can follow the document: https://learn.microsoft.com/en-us/entra/external-id/leave-the-organization
Hope this helps. Let us know if you have any additional queries. Happy to assist you further.