When trying to import from Google Drive, the following error is shown:
The certificate used to identify you as an admin was invalid and Sharegate was not able to successfully create a new one.
Any error code ending in -231.
When you use the Import from Google Drive tool in administrator mode, we create a custom certificate that we use internally to identify you as an admin. This certificate has built-in security mesures that may render it invalid at anytime. When we detect that the certificate has become invalid, we automatically try to create a new one. If we are not able to create a new one, you will see the error message above.
To fix this issue follow the Setup part of the administrator mode documentation.