Fixes I’ve tried:
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Deleting bnet folder in C:\ProgramData
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Closing processes in task manager
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Switching battlenet launcher to the Beta version
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Uninstalling and reinstalling battlenet
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Updated Windows 10, .NET and GPU
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Restarting the PC
Edit: I just tried installing WoW Classic and it works, however, I tried installed WoW PTR and it also gets stuck on initializing