Not just Google themselves, I still use my old university email and they decided recently ("for security") to block using it to log in to other sites, along wit

Not just Google themselves, I still use my old university email and they decided recently ("for security") to block using it to log in to other sites, along with a million other things, so their own staff can't even open Search Console. Fortunately, a lot of them allow "forgot my password" to go to email if you can't login through Google, but a few required new accounts.