I am having the exact same problem but none of the fixes that have been listed in here seem to be working for me at all. To provide an overview of my experience today (April 22nd 2021):
- Tried starting the game after the 13GB update from this morning, when I clicked ‘play’ it says ‘playing now’ for about 10 seconds then drops straight back to ‘play’. This repeats itself over and over.
- I tried ‘scan and repair’ to fix this, which ticks up to 100%, requests for my permission to let battle.net make changes and then get ‘whoops something went wrong’ with error code BLZBNTAGT00000BB8.
- After various google adventures I found two battle.net forums with tips to fixing the issue; BLZBNTAGT00000BB8 - Blizzard Support & Repairing Battle.net Games - Blizzard Support . I have tried all of the suggestions in both of these articles with no success.
- I found myself here on this thread trawling through a lot of people experiencing the same problem as me.
- I have taken the steps to removed all *.IDX files in data on their own, didn’t work.
- I removed all *.IDX files AND 1KB files, didn’t work
- I followed the video that @YXxAxXY tagged, removing all files expect data and then removing all *.IDX files AND 1KB files. This allowed the game to download again.
- I am now back where I started with this ‘play’ loop occurring again and still cannot access the game.
I am lost for what to do at this stage with the only other option seemingly being delete and reinstall the entire game, but at over 200GB file size I would like this to be my VERY last resort.
This is happening at the launch of Season 3 and Verdansk 80’s version which may be having an impact, but figured I’d post here.
Any advice at all would be greatly appreciated!