I don't think tplink supports any type of mDNS reflector/repeater which is needed to get chromecast to work across VLANs.

Hardware: 2 EAP245s 1 EAP225-outdoor 1 OC200 1 ER7206 (previous asus router with same issue) I have been running into an issue where when my WAN goes down for whatever reason, I lose access to my...

@NikosK I know this will sound annoying and unhelpful, but are you sure you followed that guide to the letter? Starting with a fresh oc200 and ER7026? I had the exact same problem as you with having...

@NikosK you don't need to use 0.1. After you provision the router from the oc200, you change it back to 1.1 and switch the oc200 back to using DHCP.

@NikosK Try that guide I posted above. Adoption will fail claiming incorrect password if there is a subnet mismatch. You need to a follow a certain set of steps if your devices are set up on .1.x

@NikosK Try this guide, https://www.tp-link.com/us/support/faq/2983/ , it worked for me.