Security model verification failed

Does anyone know how to fix this? I keep trying to unlink connected accounts, change the phone number, and even add an email but it doesn't work. It keeps saying that the message "Security model verification failed". It's been 17 days since I logged into the device and even the other device still won't work.

Solution:

Hello, @Kreii! Please contact customer service through your account settings of the game for further assistance. If your issue is not resolved through customer service and you do not receive a satisfactory response, you may let us know here....

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