KRE in Docker container air-gapped

I’m struggling for a few days to get KRE working. Every time a bit further, but it keeps failing and I can’t figure out what is wrong or necessary. I’m lost.

I’m running Katalon KRE from an official latest version Docker container in an air gapped environment. We bought 2 KRE licenses, but because you can’t change the machine ID I want to be sure that is is working before we activate it. So I’m using a Trail license to get thing working. I have downloaded the license (Testing_KRE_MachineID.lic) and placed it in the directory /root/.katalon/license

I’m starting it with the following command.

docker run -t --rm -v /opt/katalon:/tmp/project:Z -v /opt/katalon/license:/root/.katalon/license:Z -projectPath=/tmp/project -browserType=“Chrome” -retry=0 -statusDelay=15 -testSuitePath=“Test/TestSuites/TS_TEST” -reportFolder=/tmp/project/logs

The output for the license is :

Search for valid offline licenses in folder: /root/.katalon/license
Start checking license: Testing_KRE_MachineID.lic
Testing license Testing_KRE_MachineID.lic is valid. Please create an offline license.
The number of valid offline licenses: 0

Adding an apiKey does not improve the result.

Can’t I use a trial license for this situation?
Is there in my situation a necessity for an apiKey, of is that only necessary for an online license?