Hi Les,
Try leaving the organizations:
Leave an organization as an external user
https://learn.microsoft.com/en-us/entra/external-id/leave-the-organization
Also, there are some organizations that doesn't allow them to leave by themself:
Why can’t I leave an organization?
In the Home organization section, there's no link to Leave your organization. Only an administrator can remove your account from your home organization.
For the external organizations listed under Other organizations you collaborate with, you might not be able to leave on your own, for example when:
- the organization you want to leave doesn’t allow users to leave by themselves
- your account has been disabled
In these cases, you can select Leave, but then you'll see a message saying you need to contact the admin or privacy contact for that organization to ask them to remove you.
If this is helpful please accept answer.