Error: Failed to open the added source.

[phr34k]

I was evaluating wingetty, but I'm getting this error, I'm guessing this means is that there were api changes and winget version isn't supported?

PS C:\Users\phpfr> winget source add -n WinGetty -t "Microsoft.Rest" -a https://wingetty.dev/wg/
Failed to open the added source.