So how do you set the default organization for an existing user without clearing out the multiple organizations the user already belongs to?
- You are an agent of your Zendesk account.
- You have access to the API, and possess valid credentials to leverage the endpoints.
To set the default organization for a given user and avoid changing any existing relationship with other organizations the user belongs to, use the Organization Memberships API, particularly the Set Membership as Default endpoint.
You'll need the membership_id key for the default organization to run the API request. You can find it using the List Membership endpoint.