What is your version?
This error is related to this:
https://www.nextscripts.com/blog/bloggerblogspot-two-ways-of-auto-posting/
The problems with Free API:
The HTML code should be XHTML complaint. This is usually not a problem with clean wordpress, but a lot of third party plugins forgot to close html tags, put quotes in attributes and use
not
. Things like this will be rejected by free API and message won’t be posted.
itemscope without ‘=’ is NOT XHTML complaint, blogger rightfully rejects it.
