Sign in to RSVP via hyperlinks in Google Calendar email invitations
In order to prevent unauthorized users from responding on your behalf to Google Calendar event invitations, you’ll now be required to be logged in to use any of the RSVP hyperlinks in invite emails. Previously, organizers or anyone with a specific invitee's invitation copy could respond on behalf of that invitee.
If a user is not logged in, they will be asked to sign in to their Google Account. Note that this only applies to users with a Google account.
There is no admin control for this feature. There is no end user setting for this feature.
Rapid Release and Scheduled Release domains: Extended roll out (potentially longer than 15 days for feature visibility) starting on March 4, 2021
Available to Google Workspace Essentials, Business Starter, Business Standard, Business Plus, Enterprise Essentials, Enterprise Standard, Enterprise Plus, Education Fundamentals, and Education Plus, as well as G Suite Basic, Business, and Nonprofits customers