You can customize the keyboard shortcuts by going int the "Tools" menu and selecting "Options". Then select "Keyboard" from the "Environment" branch. From there you can bind the Edit.CommentSelection and Edit.UncommentSelection commands to whichever keyboard shortcuts you'd like.
Apparently, VS2019 has finally introduced alternative keyboard mapping schemes.They're available at Options -> Environment -> Keyboard.I've been looking for a solution for toggle comment shortcut problem and I got a whole surprise package. This is more than I wanted.
In Visual studio 2022 you also need to install the workload for ASP.NET and webdevelopment if you want to use the shortcut for Edit.ToggleBlockComment, as is explained here. If this workload is not installed then pressing CTRL + K will generate an error message in the bottom left of the IDE that says something like The key combination (Ctrl-K, ....) is bound to command (....) which is not currently available.
You can search for the required workload by entering web workload in the searchbar at the top of the IDE. The workload should pop up as a search suggestion. To install this workload you need 2 GB of free diskspace on your computer. Alternatively you can also install the workload with the Visual studio installer app. You can easily find and open this app using the search bar of windows. Once the app has started click on Modify. Then under the tab Workloads select the workload ASP.net and web development and press Modify in the bottom right. Visual studio needs to be closed before you can start the workload installation.
When you've installed the workload for webdevelopment in ASP.NET, Javascript/HTML the shortcuts should work. You can change the shortcut of Edit.ToggleBlockComment to CTRL + / by going to Tools > Options > Environment > Keyboard where you can assign the shortcut. You can leave the Use new shortcut in field on Global. After that you can use CTRL+/ to both comment as well as uncomment a line of code.