Our internal staff is attempting to import several Google documents using Confluence's import tool. However as soon as Google Drive is selected, our user is presented with a
"Import unavailable
To import from Google Docs, please clear your browser cookies, refresh the page, and allow all cookies."

However after clearing cookies, and attempting the import with other browsers (primary chrome also tested safari) the error persists.
What other steps can we try to dismiss this issue and allow connection to a google drive account?