What I did to access my second account was made a new steam account with a new email then contacted support and gave them the new email and they gave me a password. I played through the tutorial and then put in my new email address and the password they gave me and now I have my second account on a new steam account.
Problem now is when I go on my main account it takes me to the tutorial hopefully support can give me a password to get that account back.
If anyone does do this to access their second account I would suggest doing it on a Monday that way if this happens to your main account you aren’t without it for the weekend. I hope I can get it back before reset so I can do my GW battles.