Signed up to Deepnote with email (not Google or Github). I am now unable to sign in.

I initially signed up to Deepnote beta with my fastmail email a few years back. Now when I go to sign in, I only have Google and Github sign in options. Is there a way I can recover my account? I do have a gmail account, so I would be okay moving my primary deepnote credentials to that. 

Might be relevant: my Github account is associated with both my gmail and fastmail emails. My fastmail email however is the primary on that account.