@david.mossakowski
You can try to add these desired capabilities in Desired Capabilities settings of Chrome (headless):
"args":["--no-sandbox","--disable-dev-shm-usage"]
"useAutomationExtension":"false"
Related dicussion: https://stackoverflow.com/questions/50642308/webdriverexception-unknown-error-devtoolsactiveport-file-doesnt-exist-while-t