HelHHeello
Hello @Kamp, Bastian,
welcome to this moderated Azure community forum.
I tried it myself via the Azure IoT Central portal:
I was able to create an app via the custom template:
This resulted in this app:
Please check this again in another browser or in an in-private browser.
Also check if you logged in using the right email address and in the correct directory.
If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.