What parameters are accepted for 2-factor authentication?

What I’m trying to do

I tryed to enable 2-factor authentication with better than usual sha1 TOTP parameters. I used default settings for freeOTP: HOTP sha256. What parameters are accepted for 2-factor authentication?

Things I have tried

I searched help.obsidian.md and the 2-factor authentication page does not show any parameters. What parameters are accepted for 2-factor authentication?