How to Solve Xhorse App Combine Dolphin XP005L "error: nation-code"?

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One customer asked what is the nation-code error on Xhorse app. He was going to combine his Xhorse XP005L Machine but app gave this error.



Here is the Solution:
1.Login in Xhorse app first, then scan QR code to combine machine
2.If account is already entered, logout and login, and try again