This issue is caused by the Azue repo URL you use. Please do not use the old Azure repo URL which is visualstudio.com. As Katalon doesn’t recoginze this old URL, that’s why the 404 NOT_FOUND is shown when saving the repository.
Since Microsoft did rebranding of Visual Studio Team Services (VSTS) as Azure DevOps long time ago, could you please check with your team and switch to the new URL dev.azure.com? Here is the guide to do that: