Why i cant set the name in java minecraft?

I changed it well over a year ago. But I cant try to get it to update again because of the fact that it says that I already own that gamertag and still need to use it!

Also, if I Use the new minecraft launcher, its trying to get me to pick a new tag for java minecraft, but Im happy with my current name. But I cant input my current name do to the fact that I already own my current name, and have for years.

so xbox minecraft code cant be used to redeem java minecraft?

yes i installed minecraft on my mobile before, but i can play it on my pc since i bought it. So why cant i play java, is it because i installed the mobile version first? but even so, its doesnt change the fact that i can play bedrock on pc, but not java.

Minecraft for Windows, as it is, cannot be used on Xbox consoles. However, Minecraft for Windows is essentially Minecraft Bedrock Edition, which is the same edition used on Xbox consoles. That's why, for example, the Realms in Minecraft for Windows are the same as Minecraft Bedrock for Xbox consoles. In contrast, Minecraft Java Edition Realms are exclusive to PC and only accept Java Edition players.

This is why most servers, even if they are third-party, have the same player compatibility system. It's highly likely that the server you're trying to access is intended for the Java version of Minecraft. That's why it doesn't allow you to log in from the Minecraft for Windows (Bedrock) edition, while it does allow access from the Java edition of the game.

It's essential to clarify that "Minecraft for Windows" refers to Minecraft Bedrock, but that's how Mojang decided to name it on the PC platform, which can lead to confusion.

I hope this explanation clarifies things for you. If you have any more questions or need further assistance, please feel free to ask.

Same problem with me however it says play now, but i cannot change my minecraft name i click on java settings but says buy game, if anyone could help would be great..