Ok, I resolved it myself. For other people stumbling to this question or Microsoft Engineers who read this, I think this happened:
- I created a logic app with name eg. MyLogicAppTest;
- Something went wrong so I deleted this logic app and created a new one with the same name;
- This logic app was created and I configured it;
- When I tried to reach this logic app later on, it was not visible anymore.
I think the deletion of the logic app was not yet finished completely when I re-created the logic app. So something of this newly created logic app was deleted, maybe only the registration. The logic app keeps running, but is not reachable.
What I did to resolve:
Create a new logic app, with exact the same name 'MyLogicAppTest'. This is valid to do because Azure does not have a logic app with this name registered. However, when this logic app is created, the history of the old logic app appears!!! So I have my old logic app back!
I wonder what would have happened if another user tried to create a logic app with this name... would he have gotten into my logic app as well?