Cloudflared won't authorise Argo tunnel. (A permissions error)

Following the Argo tunnel quick start guide, I am at step 3, in which I must have already installed the latest cloudflared, and then run the command cloudflared tunnel login on my host server.
This command yields a URL which I paste into my browser.
Upon clicking on my website, and then clicking Authorise, the following error occurs:

Failed common permission check against resources. (Permission group: "Argo Tunnel Write") (Code: 1001)
I’ve not been able to get past this issue in multiple browsers, and my firewalls are disabled (Just in case Cloudflare can’t communicate with my server for whatever reason.) Also please note I’m the sole admin in this account, so I don’t know why there would be a permissions error.
Any help would be greatly appreciated, as I have just purchased an argo subscription and would like to get tunnel working asap.

A post was merged into an existing topic: Getting ‘Failed common permission check against resources’ error when authorising argo tunnel