Blue Post
Original thread hosted on Blizzard's official forums.
Post Update yesterday - Now unable to invite friends
View on Blizzard forums:
https://us.forums.blizzard.com/en/hearthstone/t/post-update-yesterday-now-unable-to-invite-friends/159871/5
We’re aware and the message has been updated, thanks.
Changing the Battlenet status to Online and restarting the client has solved the issue, temporarily, for some players. Please consider giving it a try while we’re working on a fix.