Why doesn't a checked out file show as checked out in azure devops site?

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Greetings,


I am from the old VSS source code version control school and have decided to try Team Foundation Server Version Control.


I recently created a project, checked in project files and decided to check out a file for editing.


A partner tried to check out the same file and was successful even though I had already checked the file out.


Any idea why this happened?


I made sure that the default workspace type is Server.


Finally, when I navigated to the Azure DevOps site, the file I checked out is not showing as checked out as well.


Any ideas why this is happening is greatly appreciated.

We are using Visual Studio 2017.

What I have tried:

I made sure workspace type is set to Server as default.

I ensured project is online.

Done a lot of googling on this but have not found any useful information.