When installing an app in Jira for a given site, the system user associated with the app is given permissions for the various flavours of Jira projects such as Jira Software and Jira Work Management. This allows the app to make REST API calls as the app user via the api.asApp() method to retrieve project information (e.g. /rest/api/3/issue/createmeta?projectIds=${myJpdProjectId}).

However, it would seem that the app's system user is not given the necessary permissions to access Jira Product Discovery (JPD) projects when using the `api.asApp()` method. Note, however, the calls do work using api.asUser(). This inconsistency in permissions is confusing for app developers.