Did you get locked out of your side account because of the force password change? Well, I found out a solution to ones who forgot their side account's password, which I did but I found out a solution myself!

Steps:
1) Log out, and go to "Forget my password"
2) Enter either your email/ID/Username in those boxes
3) Click send and follow the instructions. I went with my email, so if you did your email, go to your email and copy/paste the password it sent you to the "current password" box in your side account. Then type out your new password.
4) After you click done, boom! You have your account back.

I hope this helped. Enjoy!