thanks for your reply. Its not a problem to automate vSphere tasks in vRO but Update Manager!
I cant find any clue in the mentioned post regarding Update Manager.
The newest version of the vSphere plugin for vRO does not have any Update Manager related workflow or actions.
There is a VUM plugin you need to install I have not see one for 6.7 but it might be worth trying the 6.5 one -> Technical Preview Version of VMware vRealize Orchestrator Plug-In for VMware Update Manager 6.5
I am using this with VRO 7.6 and VC 6.5, works quite well once you figure out how to create your own custom workflows.