Disconnected from Battle.net. Would you like to reconnect?

Diablo Immortal Ticket Number: US99775690
Both mobile and PC take me to message, “Disconnected from Battle.net. Would you like to reconnect?”. No matter how many times I click “Ok” to reconnect, the message just pops back up. This is despite the fact that the battle.net client clearly shows I am online and connected.
I have cleared the cache, I have updated my system, I have ensured the Immortals application has the latest updates, I have repaired the client multiple times - all to no avail.
This keeps happening, and I don’t want to have to reinstall the game every time I want to hop on for 15 minutes (and yes, I’ve done that a few times too).

Try another network, like a mobile hotspot. If it works, then it’s probably your ISP.