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This error is caused when you have the maximum number of game accounts associated with your Battle.net account.
Troubleshooting steps to resolve error message in World of Warcraft.
Troubleshooting steps for error "Game Initialization Failed" when launching a game
It is not possible to merge the progress of two or more games into one.
Information on error BLZ51900011
Information on error BLZAPPBTS0000F
This article explains the process of speaking to a Game Master (GM).
Cannot install or Patch Call of Duty: Black Ops 4
Friend or family member used payment information without permission and I would like a refund for the purchase(s) made