Simplisafe with Arris DG3450A -- WiFi Password Incorrect

Has anyone else experienced the inability to connect to WiFi with an Arris modem/router?

I can setup the same SSID/Password on my phone hotspot and the base unit can connect to it without issue.
But trying to connect to my Arris router, the same one where I have 22 other devices connected without issue, I continue to receive incorrect password.

I know the password and SSID are correct.

I am not using any special characters and using the minimum character lengths.

Calling SS support, no real troubleshooting or diagnostics, just that they are sending me another base unit.

I am not confident another base unit will correct the issue.

I also used my phone hotspot to get my base unit up to date.

I'm thinking I'm going to have to return this $500 system for lack of wifi support.