Error attaching link. The social network could not access the site via the link

This error occurs on the Odnoklassniki side.

During publication, the social network could not access the specified page. Possibly, the link was unavailable or took too long to open.

Odnoklassniki, unlike other social networks, checks links for functionality. This cannot be influenced, so you should publish only reliable links on Odnoklassniki.

It might be that the link took too long to open at the time of publication, and upon retrying, the post will be published, as Odnoklassniki successfully verifies the link this time.