Error: Cannot connect to Calendar API: Unauthorized Client. Client is unauthorized to retrieve access tokens using this method.

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    Colin Benson

    I am seeing this error but have checked and confirmed that Calendars are turned on in Google.

    Mail and contact information completed successfully, but any attempts to migrate calendars fail.

    Are there any other reasons why this error would occur?

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    Victoriano Valdes

    I am seeing this error but have checked and confirmed that Calendars are turned on in Google.

    Mail and contact information completed successfully, but any attempts to migrate calendars fail.

    Are there any other reasons why this error would occur?

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    Greylock Team

    I'm getting this error even though I am able to log on as the user and open his calendar. Created a support ticket. Hopefully someone can assist with this issue.

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    David Gall

    Same error here... Calendar is most certainly enabled on the destination suite.

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    David Gall

    Figured this one out... You have to enable API access to MigrationWiz from within the GSuite interface.  No idea why this document doesn't mention that.

    Details ::: https://help.bittitan.com/hc/en-us/articles/115008106967-Enable-access-to-G-Suite-using-OAuth-2-0

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    Rongrin Jugsujinda

    Thank you David Gail for the solution. I almost gave it up!

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    Mario Braeken

    Thanks David ! Same here - this is the solution for the failed trail migrations !

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