If you encounter issues with multiplayer sessions, it may be related to your Facebook-to-Oculus account connection.
To resolve the issue you can try disconnecting your Facebook account temporarily or disabling the Facebook 2FA.
What is two-factor authentication and how does it work on Facebook?
If you're having trouble logging into your Facebook account, review these tips first. Two-factor authentication is a security feature that helps protect your Facebook account in addition to your password. If you set up two-factor authentication, you'll be asked to enter a special login code or confirm your login attempt each time someone tries accessing Facebook from a browser or mobile device we don't recognize.
www.facebook.com