Troubleshoot App Hub issues

This page shows you how to resolve issues with App Hub.

You can't attach a service project to a host project

This issue can occur due to the following reasons:

If the service project has existing attachments to a host project. To resolve this issue, try the following steps:
- Remove or detach the service project from the existing host project and then attach the service project to the new host project.
- App Hub API is disabled on the host project. Even if the App Hub API has been disabled, any prior service project attachments to the host project will exist. To resolve this:
  - Enable the App Hub API on the host project and detach the service projects from the host project. You can then attach the service project to the new host project.
  - Disable the App Hub API on the service project attached to the host project and then detach the service projects from the host project. You can then attach the service project to the new host project.
If the appropriate Identity and Access Management (IAM) permissions haven't been granted to the host and service projects. To resolve this issue, see the steps to grant the apphub.admin role to the principal in the host and service projects.