I'm using a private Github repo to host my intellij settings so that I can share them between workstations easily. Today I installed the latest version of IntelliJ and when I tried to import my IDE settings a got the following error: sy "Failed to set upstream repository: https://github.com/username/intellij_settings: https://github.com/username/intellij_settings/info/refs?service=git-upload-package Not Found"
I tried resetting IntelliJ passwords, I even generated a new token for it. Turns out, when I made the repository public, everything worked fine.
This of course is a temporary solution as these repositories are meant to be private since they contain system path information amongst others. This is not an issue with the latest version of IntelliJ because I've had it with version 2021.1.3 as well. Searching YouTrack issues, nothing similar comes up even though multiple people have had issues with Github connections, the issues are usually with checking out a project which worked fine for me, only the Settings Repository feature fails.
It looks like the settings sync works differently now.
Try to generate a new access token with repo and write:packages selected in "Select scopes".
It worked for me.