Hmmm... I was getting this error on both Linux and MacOS. On the Mac, I tried a troubleshooting tip of decrypting the file... and it worked! (whew!) Except, I'm not supposed to use that machine for open source work, so I need to get it working on the Linux machine. I still can't get it to work on Linux

oh wow... I just got it working on Linux. It was unexpected. I tried changing the regex in the credentials file from #"" to #"https://.*" I had wondered about this earlier, because I don't recognize repo. as a hostname, though it makes sense. I didn't pursue it because I got the Mac working, and the Mac is definitely using that regex with the URL. So how the Mac worked and Linux didn't is still confusing me. But anyway... a more permissive pattern and it came together for me.

Leaving here in case anyone else sees it