Can't Log In to a Purchased Account: Product Issue or Your Environment? What to Prepare for After-Sales

Determine whether a purchased account login failure is a product issue or a local environment issue based on the platform's error message, and prepare order number, full-screen screenshots, and environment details for after-sales support within the first-login time limit.

What to Do When Account Login Fails? Diagnose in Four Layers Before Changing Settings

A systematic four-layer approach to diagnose account login failures, prioritizing environmental, session, credential, and status issues, with special attention to DBSC in Chrome 146+.