This new feature was added recently which allowed you to search Friends faster as it would display Friends and 50 others who aren't on your Friends List on Xbox Live straight away
Xbox now lets you choose any gamertag even if it's already taken – how to change your name today | The Sun
Gamertag Lookup: Find the Tag You're Looking For
New! Xbox Gamertag Search for Profile in Three Ways
How to Recover Xbox Gamertag Online and Offline
Gamertag Lookup: Find the Tag You're Looking For
How to find a person's gamertag on Xbox by their old gamertag - Quora
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Xbox gamertag search - Microsoft Community
Nearly One Million Gamertags Are Being Released Back Into the Wild Starting May 18 - Xbox Wire
not allowing me to change gamertag to specific username despite it not - Microsoft Community
Xbox IP Finder: How To Find an IP Address on Xbox Live with Xbox Resolver (2023) - EarthWeb
Gamertag Lookup: Find the Tag You're Looking For
You can now check available Xbox user names with Gamertag.world
Xbox One - How To Search Gamertags - YouTube
PS4 Gamertag Search Online/PS4 APP/Non-official Site
Account with Xbox | Xbox
Gamertag Lookup: Find the Tag You're Looking For
Gamertag Lookup: Find the Tag You're Looking For
How to find a person's gamertag on Xbox by their old gamertag - Quora