Alan Bleiweiss: Ronnie brings up a VERY important point - just because you have the markup and do everything right, INCLUDING submitting the URL through GSC, the markup may NOT appear in the SERP at all if Google`s overall algorithm system doesn`t find enough trust across other signals to trigger the display.
Stockbridge Truslow: Trust. That`s the key word in these replies - and probably should be a key word in most of the replies to most of the questions here. Google needs to trust what you`re saying is true - and it`s got billions of other pages on the web to verify whatever you`re claiming.
Lhanz: What is the best basis of a star rating markup? I implemented a star rating markup based on GMB reviews. It did show at first. however, since updating it to match the reviews in GMB, it disappeared in the google serp.