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OAuth Consent Screen Instructions
The first time you select an event, a Google consent screen will appear for you to give the extension permission to access and edit your calendar events.

After choosing your account, you will see this warning, which is here because the extension makes use of the Google Calendar API's ".../auth/calendar.events" scope (permission to view and edit events on all your calendars). This is categorised as a sensitive scope as it grants access to private Google User Data, so I need to submit the extension for verification by Google. I'm still in the process of trying to get it verified; please 🐻 with me!
So for now, just click "Advanced" at the bottom, then click "Go to Google Calendar Event Multiselect (unsafe)".


Now click "Continue" :-)

That's it! You should be able to select events now! If you face any trouble, you can email me at leekyeyen@gmail.com and I'll try my best to help.