Cannot scan QR Code Whatsapp

After iOS 15.3.1 update, my whatsapp web on other device (laptop) was automatically logged out. I cannot log back in as I cannot scan the QR Code from my laptop through whatsapp app on my phone. I use iphone 8+. I tried everything:

• whatsapp app had been updated before ios update
• scan bar code from my phone without wifi
• remove whatsapp & reinstall
• reset network on my iphone

Nothing seemed to work. I need the solution ASAP as i use whatsapp on my laptop for work.

Thanks!