Caught in login loop iCloud with my PC

Hi!

Once per hour i get a message from iCloud on my Windows 10 PC that i must login. I type my password and then get a form for filling in the 6-digit code. My iPhone then gets a message saying that someone is trying to login to my iCloud from a PC i Stockholm, and I get the 6-digit code which then gives me another one hour break.

The sync of contacts and calendar between iPhone and PC seems to work fine even when I ignore the login alert!

The notion that my PC is located i Stockholm is false, it's not anywhere near the Swedish capital. But yesterday, when this started, I was connected over a VPN that gave me an IP address from a VPN server in Stockholm. Now, not using that VPN I still get notions on my iPhone that my PC is in Stockholm!

It seems like the iCloud authentication server a) does not know that I am logged in alright and the sync works fine, and b) doesn't have a clue of my PC:s current IP address.

So how, then, do I get rid of these annoying messages?