Adding member to organization returns MemberInvalid

I am trying to add a user from organization A to organization B. Organization A has the project which is granted to B along with the custom roles but I am getting a 400 response with

Errors.Org.MemberInvalid

Errors.Org.MemberInvalid

. The payload is

{
    "roles": ["IAM_OWNER"],
    "userId": "288662885666652504"
}

{
    "roles": ["IAM_OWNER"],
    "userId": "288662885666652504"
}

The service user has a manager role on everything and it still doesn't work.

Adding member to organization returns MemberInvalid

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