Anyone else have Smartsheet merge access issues with Google Docs?

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The smartsheet merge app has been working perfectly for years but last week I started to get this error message when trying to generate google docs. Have tried uninstalling/reinstalling, restarting and different browsers - anyone else having the same issues or know how to fix?

This app is blocked

This app tried to access sensitive info in your Google Account. To keep your account safe, Google blocked this access.

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