A few days ago, I received an email from the IEEE copyright team informing me that one of my articles had been removed from my researchgate account due to a copyright violation. However, after the 24th month of the embargo period, I published my paper on researchgate. In response to my request, IEEE stated that even after the embargo period, I am not permitted to upload articles in any public repository other than my institution's public repository.
Can a journal prohibit an author from releasing the article after the embargo in a public repository/website, such as ResearchGate?
PS: The posted article is 20~25% extended work.