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If you enable external groups, the external users created will not impact your SSO users.
To enable external groups you can go into the Admin Console > System > Settings > Externally Accessible Groups - and select Enable:
Once enabled, when users go to the log in page, they will have the option to chose between Employee Login (Okta users) and Non-Employee Login (external users):
The external users would only have access to the External Groups which they have been invited to.
These documents provide more on External Users/Groups and permissions:
Hope this helps.