Unable to find app openproject. Maybe "/usr/bin/univention-app update" to get the latest list of applications?

I deleted cache from here because I was unable to (re)install openproject:
/var/cache/univention-appcenter/appcenter.software-univention.de/4.4/

since then I get “Unable to find app openproject. Maybe “/usr/bin/univention-app update” to get the latest list of applications?” when I try to install it.
it’s also gone when I look through web.

I already tried to fix it using:
/usr/bin/univention-app update
ucr search --brief repository/online/component
univention-install univention-management-console-module-appcenter
univention-install univention-management-console-module-apps

just a quick Update (I couldn’t fix it yet)

I now removed the Member-Server and created a new one -> I get the following error while installing:
Errors were encountered while processing:
openproject
E: Sub-process /usr/bin/dpkg returned an error code (1)
Could not install the app packages
Something went wrong while installing the app
Setup failed
Could not install the app packages

Something went wrong while installing the app

Setup failed

Setup script failed!
Aborting…

How can I debug this?

I am not connected to openproject, but the app installation is logged to /var/log/univention/appcenter.log so there you should see some more details.

When debugging an installation I always like to install apps from the commandline.