You cannot view Pull Requests in the IDE, but they can be opened in the GitHub web UI without any issues. The IDE will show the following: Can't load data from GitHub [Could not resolve to a Repository with the name <organization-name>/<repository-name>'.].
When you log in to a GitHub account and perform any git operation (push/pull/fetch) against a remote GitHub repository, you see the following: remote: Permission to <organization-name>/<repository-name>.git denied to <username>fatal: unable to access 'https://github.com/<organization-name>/<repository-name>.git /': The requested URL returned error: 403
The JetBrains IDE integration app has not been allowed to access the organization's repositories on GitHub.