Seems like there is a problem with the integration, I came across this error in the logs will troubleshooting another problem.
Logger: homeassistant.components.home_connect.switch
Source: components/home_connect/switch.py:128
Integration: Home Connect (documentation, issues)
First occurred: 20:37:06 (1 occurrences)
Last logged: 20:37:06
Error while trying to turn off device: {'description': 'Key BSH.Common.Setting.PowerState has unknown enum type or enum member BSH.Common.EnumType.PowerState.Off.', 'key': 'SDK.Error.InvalidSettingValue'}
Going to try and figure out who the dev is for the integration and raise a bug
I have the same issue with a Siemens washing machine and a Siemens dryer. I think it’s related to these appliances fully shutting down when they are shut off. You can’t power them on afterwards. In the Home Connect app you receive an additional warning when trying to shut off these appliances, so it might be a different command.