Cannot Add Accessories to HomeKit

I recently had catastrophic wi-fi router failure and replaced the older Linksys Velop mesh system with a TP Link Deco system. After setup, my HomePods migrated to the new network automatically but I have 3 Meross Smart outlets that did not. I could not figure out a way to change the network for the devices within the Home app so I delete them and attempted to re-add them. After scanning the QR code I almost immediately get the following: "Unable to add accessory! To add this accessory to your home, connect your iPhone to your HomeKit enabled router, then try pairing. If this does not work restart the router." And I'm in an endless loop. I shouldn't need a HomeKit enabled router and rebooting does nothing. I've performed a factory reset on the outlets and get the same message.