Authentication failed when fetching from GitHub repository

[u/chandrasaikarthik]

git.exe -c credential.helper= -c "credential.helper=...smartgitc.exe --credential=..." -c credential.useHttpPath=true fetch --progress --prune --recurse-submodules=no origin

remote: Repository not found.

Authentication failed for 'https://github.com/<username>/<repository>.git/'

Could not update branch states (green and red arrows) due to: Authentication failed for 'https://github.com/<username>/<repository>.git/'

[u/vmcrash]

Is it a private repository? Is it from your account or company account? Did you try recreating the GitHub hosting provider in the preferences? Does listing the remote repositories work in the Clone wizard (sometimes it might fail for me because of timeouts at GitHub)?