Hi  @Ktown-Rob 

Welcome to the community!

RCS messages not working can be a frustrating, yet unfortunately common occurrence in modern networks for multiple reasons. I'll go into a few, and hopefully one of them helps resolve this for you.

First, is your main Deco connected to another router via Ethernet? Or is it connected to a modem-only device? If it's connected to a router, this could introduce a "Double NAT" scenario, which can cause RCS anomalies. If this is the case, it would explain why you can send via RCS when you're not on the Deco network.

That said, there are a few things worth trying to see if it resolves this behavior for you:

2. Have you tried changing the DNS settings for your Deco? If not, I'd recommend giving it a shot. Sometimes, an ISP's default DNS may fail to resolve RCS servers correctly. For instructions on how to change your Deco's DNS settings, I recommend visiting our FAQ here: How to change DNS server settings on my Deco

3. Is your iPhone's "Private Wi-Fi Address" setting currently turned on? Sometimes this can cause anomalies with RCS over Wi-Fi. If you are comfortable with using your iPhone's real MAC address on your home network, you can usually toggle this setting on your iPhone by going to Settings > Wi-Fi, tap the (i) icon next to your Deco's network name, then toggle Private Wi-Fi Address to "Off", (or "Fixed" if you see that option instead).

If either of these were the culprit, these changes should address the odd RCS over Wi-Fi behavior you're currently running into.