After going through over 300+ posts, not a single one shared any diagnostic tests to give readers, and more importantly SquareEnix, a better understanding of what is really happening, except for
post#85 , that instructed how to present data that will help isolate the problem of the error 90k.
I was hoping to see some diagnostic tests, especially in a thread titled "Constant 90002 Error", but boy am I disappointed.
FF14 Server Status and IP Addresses
Use the above link to get the IP Address that will aid you in performing diagnostic tests. It will be of great help to yourself and to SquareEnix in identifying the problem.