[Bug] Error while adding certain account

[JupiterBlooper]

Describe the bug

When I try to add one specific account i get the error: java.lang.IllegalArgumentException: authXSTS response: 401 It only happens when i try to add a specific account, which is 100% playable otherwise. Adding it offline works, but online doesnt

To Reproduce

1. Launch the game
2. Try to add account url1 to account switcher
3. Sign into Microsoft successfully
4. Get error

Minecraft Version

1.19.3

Logs/Screenshots/Videos

No response

Checklist

• [X] I'm using the latest mod version
• [X] I'm using the latest Forge or Fabric/Fabric-API for my Minecraft version

[someretical]

I was getting the same error as you (it's how I found this thread in the first place lol) but when I tried adding the account through MultiMC (separate program), it said that the account that I signed into did not own Minecraft.

You could try logging in through MultiMC because it gives you a more detailed error message.