Posts are often rejected due to the content of the post, the photo/image being used, or if the business is in a “sensitive” topic area.
Sometimes words within the post will trigger the rejection of a post. The word may seem benign, but it may be on Google’s “offensive” word list (rejected posts are controlled on Google's end and not Social Marketing.)
If your post gets rejected, try re-wording to a more generic body copy, and don’t include any sensitive words or images.
Previously, it was acceptable to include your phone number or a website URL in the body of a post. Google is now rejecting many posts with phone numbers or URLs. So if your post is rejected, try taking those elements out.