I don't have permission to open an app I created

So, I understand that for personal use/fun, if you have two computers, it is very hard to have whatever app you created work in both, unless you are a certified developer which, for an hobbyst, is not too convenient.
Basically, Apple took away all the fun of creating your own app in the name of safety.
Thanks a lot

No, you somehow have screwed up the permissions of your app. You don’t need to sign the app if you only use the app yourself.

Neither. I’m talking about your AppleID for the iCloud, the AppStore, …

Is Ausbrich in English as well??

Yes, it is - and some other languages….