Error: “Sorry, this content could not be embedded” when using the Embed block

Answer: turned out the link was a redirect. After the original post was published, I changed the title, and then Yoast created a redirect. So the solution was to embed the permalink of the destination post and not the original permalink.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)