Salesforce Authenticator is an app that allows users to verify their identity when logging in to Salesforce using two-factor authentication (2FA). 2FA adds an extra layer of security by requiring users to enter a verification code or approve a notification on their mobile device after entering their username and password.
To look at how many users have successfully used Salesforce Authenticator since it was rolled out, an administrator can use two ways:
A) Run a session setting report, specifying login methods by user.
A session setting report is a report that shows information about users' login sessions, such as login time, location, IP address, browser, platform, etc. A session setting report can also show the login methods used by users, such as password, verification code, or notification. By running a session setting report, specifying login methods by user, an administrator can see how many users have used Salesforce Authenticator to log in to Salesforce. Reference: https://help.salesforce.com/s/articleView?id=sf.reports_session.htm&type=5 C) Create a new view in Identity Verification History, specifying Method.
Identity Verification History is a page that shows the history of identity verification attempts for each user in the org. Identity verification history includes information such as date, time, status, method, and IP address of each attempt. By creating a new view in Identity Verification History, specifying Method as a filter criterion, an administrator can see how many users have used Salesforce Authenticator to verify their identity when logging in to Salesforce. Reference: https://help.salesforce.com/s/articleView?id=sf.identity_verification_history.htm&type=5

Another quote is already synced with the opportunity will prevent a user from syncing a quote with an opportunity. Only one quote can be synced with an opportunity at a time. If a user tries to sync another quote, they will get an error message saying that the opportunity already has a synced quote. Reference: https://help.salesforce.com/s/articleView?id=sf.quotes_syncing.htm&type=5