In Zitadel the organization of the user must be granted to the project
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Fyes this is the right request: https://zitadel.com/docs/apis/resources/mgmt/management-service-add-project-grant
Grant a project to another organization. The project grant will allow the granted organization to access the project and manage the authorizations for its users. Project Grant will be listed in the granted project of the granted organization
Fif it is enough to grant the organization, depends on your use case. you can either grant only the org, or adding also specific users