When you try to copy the link to another player's character, the Realm in the coppied link appears in that realm's original language, but in practice in the WoW website, the realm names are romanized. So the link leads me to an error page.
For example,

My characters page adress is
https://worldofwarcraft.com/ru-ru/character/eu/gordunni/Натаари

But when I try to copy it ingame, I get the following link:
https://worldofwarcraft.com/ru-ru/character/eu/Гордунни/Натаари

Notice how the realm name here is Гордунни when in reality it should be Gordunni.
I don't really know if the issue persists in other non-latin languages as well, like Chinese or Korean, but I have a reason to believe it does.

Love your addon, it's very convenient, looking forward to the next update!

Hey once again!
I'm not sure how useful is this, but I managed to find This
It's supposed to be an API library with the possibility of returning the english API name.

Hello again! I'm able to reproduce this behavior, but it looks like there's no API method that returns the Latin realm name necessary to properly support this. As far as I can tell, the only way to fix this would be to manually maintain a list of realms and their Latin names to do the conversion on the fly, which I'm not terribly comfortable adding to this addon.

I'll think about this in case I can come up with something better, but the solution will probably be to disable Armory links on Russian and Asian servers. I don't like that idea, but I'm not really sure what else to do.