credentials error

Are you trying to log in on a 360? One? 360 emulator on the One?

Where are you trying to sign in at?

If you are trying to sign in on either the emulator on the One or a 360 itself make sure your password is less than 16 characters the 360s including the emulator on the Ones do not like passwords longer than 16 characters.

Basically the password box is limited to 16 characters and if you try and type a password in longer than 16 characters it will stop at the 16th character and when the system tries to verify the password is correct since the password was not totally entered
it will come back as invalid password or credentials.

It should also be noted that in the future any error/status codes you receive from any Xbox device can typically be looked up on the Error Code Lookup bar found at the link I'll provide you.

https://support.xbox.com/en-US/error-code-lookup

Hi junim,

Thanks for your post. I understand you are experiencing an issue with logging into your Xbox 360 profile and receiving the error code:
801540A9. Check out this page for steps on how to troubleshoot this issue: Error 801540A9.

Please keep us updated.

I am sorry to hear that you are not able to link your Epic account. Usually the red box is accompanied with small type that gives the error of either the account name or password is incorrect.

It might take you resetting the password for your Epic account (I think I understand you are trying to link via Xbox). The other method would be to link to Microsoft from your Epic account (which is what I did).

Also I would try to make the password not have special characters, just numbers and letters as that seems to transfer between systems the best.

Let us know how it works out.

Philip

Yes this is what's called having your gamertag locked for investigation . I've had to do it once. You'll need to wait till they finish the investigation before you can use the account.