401 Response: Invalid application Id on call to Registrations API

  • I'm able to create a user and receive back the user info including the FusionAuth assigned user Id, but when trying to register that same user to an application I continue to receive a 401 Status Code:

    • Code: [Invalid]registration.applicationId.
    • Message: An application with Id [my app id] does not exist.

    Additionally, I have multi-tenants set up on FusionAuth Cloud deployment.

    Also, I am currently using FusionAuthSyncClient from the FusionAuth.Client NuGet package.

    Any help would be appreciated.

    Thank you.

  • This is actually a 400 Response.

    The fusionauth-app.log shows the following error:

    The error may exist in io/fusionauth/api/domain/UserMapper.xml

    The error may involve defaultParameterMap

    The error occurred while setting parameters

    SQL: INSERT INTO user_registrations (id, applications_id, authentication_token, clean_speak_id, data, insert_instant, last_login_instant, last_update_instant, timezone, username, username_status, users_id, verified) VALUES (?, ?, ?, ?, ?, ?, ?,?, ?, ?, ?, ?, ?)

    Cause: org.postgresql.util.PSQLException: ERROR: null value in column "users_id" violates not-null constraint

  • This error happens when trying to register a user to an application that doesn't reside within the user's tenant, which leads me to my next question:

    Can you have one application that is shared across tenants?

    The FusionAuth documents covering multi-tenants gave me the impression that you could, but it seems as though you have to have an app residing within the same tenant you wish to register a user to that is also a member of that specific tenant.

    I'm looking for insight as to how multi-tenants works within FusionAuth. At this point, it looks like you have to have a copy of an application within every tenant, even though it is essentially the same application - roles, etc.

    Thank you.

  • Hi @mehamm!

    All applications are associated with one and only one tenant.

    You may find some answers to your questions around multi-tenancy here:


    I will also excerpt from the article

    A FusionAuth tenant is simply a namespace where Applications, Groups, and Users exist

    Another article that might be of interest is below:

    These articles should help you understand the concept of tenants as it applies to FusionAuth.

    I hope this helps!


  • @joshua

    Everything works great when I have an application assigned in each tenant. Before proceeding to make an application per tenant, I just wanted to make certain that applications can't be shared across tenants. The good thing is that your APIs make it easy to create them.

    Thanks for your support!

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