@tlowe & @calin - I had the exact same experience as @adwazime. When this was happening to me I filed a DTS ticket. Then a day or two later the problem seemed to magically fix itself. Good luck!

There seem to be very few reports of this problem. But I'm seeing it today on my Mac Studio M4 Max running Sequoia 15.6 and the latest build of Transporter v1.3.4 (13410). "Can't authorize your user at this time." "Unable to process authenticateWithProvider request at this time due to a general error (1020)" ALSO seeing "The server returned an invalid response. This may indicate that a network proxy is interfering with communication, or that Apple servers are having issues. Please try your request again later. Status Code: 502 (bad gateway)" This has got to be something broken on Apple's end. Does anyone happen to know a work around? BTW I've used Transporter for years. Last time I used it was June 3rd of this year.