I have been looking for fixes. Tried a few. So far only #4 managed to remove the block

From the Deco app:

1.  Disabled Malicious Content Filter, Intrusion Prevention System, Infected Device Quarantine

2.  Goto "Malicious Content Filter" tab. Press the text "Tap to Reflesh" 

3.  Press "More" icon. Press "Advanced". Goto "MAC Clone". Enable "Mac Clone". Select "Use Client MAC Address". I just tried a few connected to the network. Save to exit

4.  Press "More" icon. Press "Internet Connection". Goto "IPv4" tab. Click on the box with Primary/Secondary DNS. I use 8.8.8.8 for Primary, 8.8.4.4 for Secondary