How to add zoom links to your message templates
Install the Zoom for Google Workspace add-on. With this you can create a meeting and sync it with your calendar invites.
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Then when creating a calendar invite, select the 'add video conferencing' button
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In your message templates set the meeting_loc field
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If you don't wish to add the Zoom add-on, you can use the location field and paste the zoom link there instead
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