Permission error while updating

I recently downloaded MW II and wanted to update it, have gotten error no: BLZBNTAGT00000870, which basically asks for admin privileges from windows for battle net to make changes.

Tried a bunch of things like logging out/in, launching battle net in admin mode and so on.

Turns out overwatch was trying to update in the background also, cancelled that and it is fine now.

Might be considered a bug since the error was resolved by something completely different in the error text.

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had the same problem but nothing was updating in the background and it still kept happening Iā€™m gonna try restarting my PC now

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restarted my pc and reupdated it, it asked me for permission again and I allowed it and then it worked!