As people have explained in the comments, that tag might not be appropriate for Super User. If you were going to create it (and I would suggest based on those comments that you don't), you could deal with the length limit by partially abbreviating it, e.g. vs-team-services. The tag wiki excerpt would then clarify what exactly the tag is about, and people would likely associate Visual Studio with the phrase "team services", whereas I wouldn't immediately have a guess about vsts.

Also, the reason you're receiving that error message is that tags differing only in hyphenation or capitalization are no longer allowed. If I understand correctly, only moderators can create tags that would be blocked by that check (there are legitimate exceptions to the rule, like windows and window).

As people have explained in the comments, that tag might not be appropriate for Super User. If you were going to create it (and I would suggest based on those comments that you don't), you could deal with the length limit by partially abbreviating it, e.g. vs-team-services. The tag wiki excerpt would then clarify what exactly the tag is about, and people would likely associate Visual Studio with the phrase "team services", whereas I wouldn't immediately have a guess about vsts.

Also, the reason you're receiving that error message is that tags differing only in hyphenation or capitalization are no longer allowed. If I understand correctly, only moderators can create tags that would be blocked by that check (there are legitimate exceptions to the rule, like windows and window).