To add to @KMT's reply: I was playing with a test app that wasn't released and wanted to reset the build numbers so deleted the app... as KMT said you then can't re-use that Bundle ID. After a bit of digging I found this apple page: https://developer.apple.com/help/app-store-connect/create-an-app-record/remove-an-app The basics of it is you can restore an app as long as nobody else has grabbed the bundle id! Apparently OTHERS can re-use it but not you... 🤷‍♂️ I'm sure it makes sense to Apple! Here is the instructions to restore it from that page: Restore an app From My Apps, click the arrow next to All Statuses on the top right. Note: If the removed app is the only app in your account, the app will be listed in My Apps. Restore the app by following steps 3 to 6. From the menu, choose Removed Apps. Click the app you want to restore. In the sidebar, click App Information. Scroll to the Additional Information section and click Restore App. In the dialog that appears, select Limited Access or Full Access, then click Restore.

5 years with no reply seems a bit long. Gitea has OAuth logins just the same as GitLab. Can't we get this implemented?

I believe the sample project is faulty. If you create a new project, copy the files over and run it you'll find it works fine...