Please note that there are two known issues that we cannot fix on our part.
We apologize if you experience these issues when setting up your app. We reported them to Atlassian, so hopefully they will fix them soon.
Atlassian Forge limitations
Prime Custom Fields is built using the Atlassian Forge framework, which includes the following limitations:
Team-managed projects are not supported
Jira Service Management projects are not supported
Setting default values to Prime Custom fields is not supported