I have done this great Tutorials here Blackbean RM Mini 3 - openHAB - Google Home and was able to get the setup working.
Unfortunately I see only 3 items on myOpenHub but I have currently 10 items selected to be synced. I have waited already more than 3 days because I heard it can take some times.
Can someone tell me what I need to do. I saw some posts about pesits files but have read that this is not requered anymore on the myopenhub documentation