How to connect Google Calendar with frappe

ERPNext
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Hi all,
Here, I need to connect with Frappe using Google Calendar. I added the Client ID and Secret to the Google Settings Doctype. Clicking the Authorise Google Calendar button on the Google Calendar doctype redirects you to the Google login page. After successfully logging in, it shows 403 Access Denied. Does anybody know how to solve this?

Thanks in advance

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Reference video

here is the reference video of integrate google calender with frappe/erpnext step by step