Cannot invite user as admin on specific domains

What is the name of the domain?

mysa.is, vensl.org

What is the error number?

1005

What is the error message?

Error when processing member: Cannot add existing user that is participating in an incompatible authorization system(Code: 1005)

What is the issue you’re encountering

Unable to add admin to specific domains

What steps have you taken to resolve the issue?

Try to add user, doesn’t work…

What else is there to try?

Could be the issue is as described in a post from below:

Please, do as follows:

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