I did not get such a message, but I guess this may be one of their measures to fight fake profiles. This message was hardly sent by a human but rather by an automated algorithm. Unfortunately, ResearchGate's software seems to have some shortcomings. And the help pages (https://help.researchgate.net/hc/en-us) are not always helpful - I could not find anything on this verification process. During the last weeks, there have been several questions by users about this, see https://www.researchgate.net/post/There_is_no_Afghanistan_Sciences_Academy_in_the_list_of_ResearchGate as an example.

Thanks for your comments.

Today I found this help page about verification: https://help.researchgate.net/hc/en-us/articles/26108483493521-Verification-on-ResearchGate