Yep same thing happened to me a few months ago.
Progressively go worse until the indicator arm was up, single flash with 1 click and then nothing. Mine was also the Hazard warning switch, it is an all-in-one integrated unit.
I had to drive around for 3 weeks without any indicators
(and putting up with people trying to tell me they were busted),
because they were on back order.
Hopefully, in your case, you won't have to wait as long as I had
to!