There may be a bug in the Google My Business Google Posts feature. The number of complaints about rejection notifications for Google Posts has increased. Now, when a business owner posts an update on Google Posts, those updates are more likely to be rejected.
Joy Hawkins said on Twitter, "There are a lot of people who are currently having issues with rejected Google posts. Google is aware of this and is reviewing this. Right now I would just try to repost the same thing, and if that doesn't work, easy wait a few days. "
Here is a screenshot from the Google My Business Help forums with a rejection notification in Google Posts:
There has been an increase in complaints about these rejections on the Google support forums. It's unclear if this is a bug or if Google is getting stricter with Google Posts. This happened before last year.
Forum discussion on Google My Business Help and Twitter.