I've been getting these on my LinkedIn account since a couple of days. Every few hours I get an email with a magic login link. They seem legitimate, originating from various locations around the globe.
I have changed the password, main mail and in the privacy settings of LinkedIn removed the visibility of the email
Unions are on board with this, see e.g. https://unitedafa.org/news/2020/5/9/employment-verification-...