Rick Sheehan, a friend in the US, reported that he recently ran into a problem updating Gaming Services; showing an error 0x8007139f. Since then, he couldn’t load MSFS (Microsoft Store version) any more.
After searched more than 50 sites and tried numerous possible fixes including several PowerShell fixes to no avail in a few days, he found a solution to get past the error, at the brim of reinstalling the simulator.
All he did was calling up the Run App and typed “wsreset.exe” to clear the cache of 
the Microsoft Store. After that, the Gaming Services resumed updating as usual again.
He said the solution was from WindowsReport.com here.
One more thing, Rick added that the error code during his “search and trial” period was somehow changed from 0x8007139f to 0x80073D26. Their descriptions are similar but he has no idea how or why it happened.
Anyway, the tip works.
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FSX TIMES 