Watch the video:
Timestamps:
0:00 - Intro/The issue
0:20 - Fix can't login to PAYDAY 3
1:43 - Link Steam account
Can’t get past the PAYDAY 3 Login Page, or getting a Nebula Connection Error? This video shows you the simple steps to fixing it. The servers are VERY stressed at the moment, so do expect some issues for the beta…
Starbreeze/PAYDAY 3 Login: https://nebula.starbreeze.com/account/linked-accounts