Why do I have 2 gamertags when I tried to just change the original one?

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proof of payment and visual aid.

Creating a new account and changing the gamertag. However, when I tried to change my original account's gamertag to the new one, it was still unavailable. It seems that even if I use the gamertag on a different account, it remains locked.

Check your profile in the Xbox app (not the console companion app). See if it shows you as having 2 gamertags. They'll have one on top of the other. The bottom one will probably show the gamertag that shows up for you in game. That's considered a "classic" gamertag. Sometimes when people change their tags, the system keeps their original tag as the tag to show in games that haven't been updated for the new gamertag policy. I know the system does that when people use special characters for their tag, but I'm not sure why it does it when people don't. That tag would have to be changed on a 360.

I have 2 accounts. My original xbox account had my gamertag changed from the default one to the one it has now (the gamertag I would like to have) and I have my new account which I had as a Microsoft account before they were merged. My Microsoft account is what I use everything for, but I want to have my Xbox gamertag on that account. That account was set up as an Xbox account, and when I tried to change the gamertag for it, the limit for characters was 12. So in short I have had the gamertag in the past, and still do. But it needs to be put onto a different account. And to be clear, the gamertag is the only thing I care about from my original account. If I can get my Microsoft account to have my gamertag I would likely delete my old account entirely.