AirVpn Japan not working on Netflix

[Timm04 0]

I watched One Piece on Netflix Japan using some Japan server on AirVpn.
Today wanted to continue watching but when I turn on the VPN, Netflix won't show One Piece anymore as well as all the other shows that should be available.
I tried connecting to some American server and it shows the right shows but for some reason only the Japan server don't.

I tried restarting my PC, deleted my browser cache, relogging into Netflix, using a different browser, trying all the other Japan servers, yet nothing works. 
I use the default settings in AirVPN.

Any ideas what else I could try?

Edited ... by Timm04

[OpenSourcerer 1468]

Netflix is not supported officially since the service is quite good at restricting VPNs, so whatever you did, it was a streak of good luck.
Specifically for One Piece, it can be streamed on Crunchyroll which is much more lenient about VPN usage (or maybe not lenient, but still no comparison to the thoroughness of Netflix).