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Is your VS2019 up to date (patch wise)? Can you install the extension if you run VS as an admin? Can you install the extension if you use the VS installer instead of from within VS? If you opt to not go with the repair install route, there are other things you can check. But I'd tackle the "repair install" route first as that is the easies one to handle (my opinion). OR your antivirus may be grabbing the extension and quarantining it before VS can install it. I am not sure what permissions are required to install extensions.
![how to repair visual studio 2017 how to repair visual studio 2017](https://i.stack.imgur.com/E9QQM.png)
Or it may be you lack permissions to install extensions into VS2019. If you and your coworker both had VS2019 installed by someone other than you, it MAY be an improper install and in need of a repair. I may "require" SSRS with VS2019 while a coworker in my department may no no SSRS work and may require SSIS with VS2012 to support an older system). My requirements may not match a coworkers requirements for example. There are 2 reasons for this - licensing costs (to install a Visual Studio subscription based tool (formerly MSDN), you NEED to have a Visual Studio subscription at the same level or higher as the tool being installed), and tools required (IT has no idea what tools I require. It is up to the developer to install any development related tools (visual studio, git, etc). In my environment, developers are given base installs of machines when they get a new machine which comes with a bare Windows install and an Office install.
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A repair install doesn't hurt though - it could be something with an update or if your computers were built from a WSUS image (for example) with VS2019 pre-installed, the image may have some missing information.