Two-factor authentication adds a second step to your Opensolr login: after your password, a code sent to your phone. It takes about a minute to switch on and it applies from your next login.
Enabling 2FA is a one-time setup. From then on every login asks for the code.
01 · Turn it on
Sign in to your Opensolr account
Go to opensolr.com/users/login with your usual email and password.
Open User, then Two Factor Authentication
Direct link: opensolr.com/admin/solr_manager/tfa.
Enter your phone number
This is the number the login code is sent to. Use a phone you carry, not a desk line.
Two-factor authentication protects the account, which is the key to every index on it. If several people share one Opensolr login, give each of them their own account through Teams instead, and let each one carry their own second factor.