0x87DD0005 error when trying to start Cities Skylines Windows 10 Edition

I'm having the exact same issue. Still searching for a resolution.

After 2 hours chatting with Microsoft support and emailing the developer, I am still unable to open this game. Any help out there?

Having checked the Microsoft store for the season pass for the Windows 10 version of the game, there isn't one listed. It's possible you ordered the Xbox One version of the season pass by mistake.

here is the Win 10 link for Skylines
https://www.microsoft.com/en-us/p/cities-skylines-windows-10-edition/9nwvc7xp3pfd?SilentAuth=1&wa=wsignin1.0&activetab=pivotverviewtab

Here is the Xbox One version
https://www.microsoft.com/en-us/p/cities-skylines-xbox-one-edition/c4gh8n6zxg5l?activetab=pivotverviewtab

You might notice there is no season pass listed for Windows 10 version.

Cities: Skylines is available also on Game Pass for PC, it's just a diffeent version (Windows 10 version). It may have region restrictions eventually, but it is available otherwise on the pass:

https://www.microsoft.com/en-us/p/c...nwvc7xp3pfd?rtc=1&activetab=pivot:overviewtab

Hello Jez, this is Manuela. I'm an Independent Advisor and community user like you, ready to assist with this.
Not a Microsoft employee.

Please verify if all the Xbox services are running on your PC.
For this, search Services by using the Windows search feature and look for the next services once you open the program:

IP Helper
Xbox Live Auth Manager
Xbox Live Game Save
Xbox Live Networking Service
Gaming Services

Then, do this for each service:
Right-click on it and select Properties. In Startup type, make sure it’s set to Automatic.
If the service isn’t started, click Start Click Apply and OK to save changes, restart your PC and try again.

**If you're not able to do this with Gaming Services you can skip that part

If the inconvenience persists, please try reinstalling gaming services by following the next procedure:

“ Select the Search icon on the taskbar, type powershell, right-click on Windows PowerShell, and then select Run as administrator.
In Windows PowerShell, type the following command and press Enter:
get-appxpackage Microsoft.GamingServices | remove-AppxPackage -allusers
In the same window, type the following command and press Enter:
start ms-windows-store://pdp/?productid=9MWPM2CQNLHN
Install the app on that page and select Yes when you receive the User Account Control (UAC) prompt.
Restart your device and try to open the game again”

You can review these steps here:
https://support.xbox.com/help/games-apps/troubl...