@Registered55 Curious to know which region are you in? The firmware versions available might also be different based on the region you are in. I'm in EU and I have the same hardware version 3.0....

@David-TP Thanks! I have upgraded to the beta version. The clients connected seamlessly to the Guest network after the upgrade. I'm currently monitoring and will post here if I notice anything out of...

@eppy I am now running the initial setup, with clients on the Guest network. I had to restart the ISP modem to make that work. However, the issue is still randomly reoccurring from time to time....

@David-TP Deco M5 with firmware 1.8.5 seems to also be affected by this. I have rebooted the ISP modem, as suggested in the workaround, and the clients were able to connect to the Guest network.

@eppy I have just tested the workaround suggested in the cross referenced thread: Reported Issue and Workaround: Guest Network works only on Main Deco - Home Network Community What I did was: 1....

I have the same situation, with two M5 connected via wired backbone. The workaround suggested by @eppy worked for me as well: 1. rename the Guest network 2. disable the Guest network 3. enable an IoT...