My NSA325-V2 isn´t visible in MyZyxelCloud

Hello guys,

First time here so hello everyone and sorry for any dumb questions i may post here.

I'm running this NSA325-V2, FW 4.81, and so far I'm very pleased with it, been working flawlessly since I have it so I'm not willing to put it away while it works really good for my needs, and also for many users as far as i can understand in this forum, is still a good piece of hardware for the purpose it was designed for.

I have two question in fact, but i will post one for now, why can't I access to my NSA325-V2 using MyZyxelCloud? It was listed when I registered it a couple of years, and it was listed a few days ago but it wasnt refreshing the IP address so I've removed it from the list and now I can't add it anymore. I've tried to add it manually but no joy (i've used MAC + S/N); I'm in the same local network, NAS uses ethernet cable and my PCs uses Wifi (if that matters) but all on the same local network. I can ping "a.root-servers.net" and I get "Successfully pinged host"; The NSA is on the DMZ of the router just to make sure the router isn't blocking anything, static IP assigned both in router and in NSA, Ive tried in Win7 and Win10, neither works; Browsers are Opera and Chrome, no joy on any of those; DNS is changed to 8.8.8.8 in the NSA also.

What else can I do?

Thank you!