Same regions described as different

When I try to create a channel with my friend “Rodolf”, I get this message:

Friend request sent to Rodolf in Blizzard region US

Rodolf is playing StarCraft in a different Blizzard region than you. Your friend request to Rodolf has been sent in the region you are playing in (US), and they will receive the friend request when they switch to US. (Failed to make initial server connection (Error 2:7))

Why does the message say we’re both in the “US” region and also in different regions? Neither of us has ever played outside the US region.

Hey, ArnoldRimmer! Are you and your friend logging into the same region from the Blizzard Application and not the gateway in-game? If not, could you try switching to a different region and see if the problem only happens on the US region?