Oauth key generator not working

Getting an error from your domain oauth.gsheetconnector.com when I try to “Get Code” through Contact Form 7 – Google Sheet Integration screen. My domain is redacted from examples below.

Url it’s directing to:

https://oauth.gsheetconnector.com/index.php?client_admin_url=https://www.x.com/wp-admin/admin.php?page=wpcf7-google-sheet-config&plugin=cf7gsheetconnector

Error displayed:

Multiple Choices
The document name you requested (/index.php) could not be found on this server. However, we found documents with names similar to the one you requested.
Available documents:

/index.html?client_admin_url=https://www.x.com/wp-admin/admin.php?page=wpcf7-google-sheet-config&plugin=cf7gsheetconnector (common basename)
Please consider informing the owner of the referring page https://www.x.com/ about the broken link.`