Microsoft removed the public Gamertag lookup tool. You can no longer just type a name and see if it exists.
Here’s a ready-to-post message for social media, forums, or Discord, depending on where you want to share the topic. Option 1: Help/Question Post (For Reddit, Xbox sub, or gaming forum) xbox name search
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Need help with Xbox name search – Gamertag not showing? Microsoft removed the public Gamertag lookup tool
Trying to search for a friend or check if a specific Gamertag is available, but the Xbox name search isn’t working like it used to. xbox name search