Nothing will connect with HomeKit after upgrading Spectrum Internet

I upgraded my Spectrum internet last week to 1gig. Prior to installing my new router and modem, everything in HomeKit was working wonderfully. Once I installed the new equipment (and was forced into a new network credentials), I started having issues with accessories being unresponsive. I tried deleting them and re-adding them, and now, non of the hubs or bridges will connect. I use a Hue bridge and Sengled bridge. They worked like a dream before, now they can’t connect. I have power cycled everything, frustratingly restarted my modem and router several times. I deleted old network from my phone. Deleted and reinstalled the HomeKit app. I reset both my Hue and Sengled bridges — to no avail. My smart lights works perfectly in the native app, and they CAN be controlled through Alexa just fine. This points to HomeKit being the problem. I’m at my wits end because I have power cycled and restarted everything (including my phone, Apple TV, all accessories, and bridges). I’m on the latest software. Everything was working until I updated my spectrum equipment. Any suggestions (other than turn it on and off again) would be extremely helpful.