Import/Export extension is not working (error included in details)

When I attempt to run the import/export extension I receive the following error:

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Based on your assigned extension URL I’m assuming your account was provisioned through Heroku; if my assumption is correct and given this seems an issue specific to the authentication into the extension itself you should consider the reply to this post Cannot configure authorization extension as that may be the source of the issue:

This is a limitation of Auth0 accounts created through Heroku. For now you will have to invite a new dashboard admin to your account, accept the invitation and configure the authorization extension with that new account.