For anyone waiting for NSERC and receiving error messages when they try to log in to Extranet, login using this link: https://influence2.nserc-crsng.gc.ca/sites/800000
I called the NSERC helpline, they provided this link, and I was able to get in.
Good luck!
I received an e-mail from NSERC last night around 9pm EDT. Reset my password using the link they provided, but I'm still (at 6am EDT) getting "500 INTERNAL SERVER ERROR" on chrome on my phone and "Access Denied - Error 403" on microsoft edge on my laptop.
Sharing my experience thus far in case it's happening to anyone else too - you're not alone lol