Error 0x800704c6 on updating/reinstalling Gears Tactics (Win10, Xbox Game Pass)

I've been playing Gears Tactics on Windows 10 via Xbox Game Pass for the last few days. Everything was working fine until it tried to install an update yesterday. The download hung at 246MB out of 2.8GB, with an error code 0x800704c6, message "couldn't connect to the service". I cancelled it, which uninstalled the entire game. When I tried to reinstall, it hung again, at the same place (but now out of a 28GB download).

Things I've tried:

Reboot the machine
Repair/reset/uninstall/reinstall the Xbox Beta app
Run the Windows Store troubleshooter
Run wsreset as admin
Run sfc /scannow as admin
Reboot with a clean start (no services/startup apps loaded)
Install from the Windows Store
Install from the Xbox Beta app

Is there anything else I can do, short of nuking and reinstalling the OS entirely?

I can install other XGP games (just tried and succeeded with Moving Out), so the problem looks to be specific to this game.

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How do you fix Xbox Game Pass not downloading?

Click on Troubleshoot option. Scroll down and click on Windows Store Apps and click on Run the Troubleshooter. The troubleshooter will scan the system for any problem related to the Windows Store and recommend fixes accordingly. Wait for the fixes to apply and then relaunch Windows Store.

How do I fix my Xbox Game Pass on my PC?

A quick fix to reset the Microsoft Store app could also fix your Xbox app problems. Press Win + R , then enter the command wsreset.exe . This should reset the Microsoft Store app and possibly fix your Xbox app problems.

How do I force a game to update on game pass?

Get updates for apps and games in Microsoft Store

Select Start > Microsoft Store.

After you've opened the Microsoft Store app, select Library > Get updates.

If there are updates, select Update all or choose which apps you want to update.

ENTENDENDO GEARS TACTICS - [by Xbox Game Pass]

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Pixabay, Pixabay, Gladson Xavier, Pixabay