If nothing in my last post works, the MS Store may need to be fixed. I'll give you everything possible that works to fix the Store, based on helping to fix it daily for years here. Even if you've tried a step, please do it over in this sequence:
1) Try updating Store apps:
https://support.microsoft.com/en-us/account-bil...
Check also the Windows 10 Version number at Settings > System > About. If less than 1909 skip to Step 11 to upgrade to the latest by the most stable method.
2) Right click on the time and date in the far right corner of the taskbar. Choose Adjust Date and time settings, at the top make sure the time is correct. If it’s wrong, manually adjust it and make sure the sliders for Set time automatically and Set time zone automatically are set to on.
3) Re-register the Store app from Option 2 here:
http://www.tenforums.com/tutorials/3175-apps-re...
4) Type Services in Search box, run Services app as Administrator, open Windows Update Service and Background Intelligent Transfer Service and Stop both.
Press “Windows (flag) key + R,” copy and paste C:\Windows\SoftwareDistribution\ press the Enter button.
This folder has all the files related to Windows updates.
Open the “Download” folder, select and delete all the files.
Restart Windows Update and Background Intelligent Transfer services in Services app by opening both and choosing Start.
5) Try running the Windows Store apps Troubleshooter in Windows Settings > Update & Security > Troubleshoot.
6) Type CMD in Search box, Run CMD as administrator, type WSReset.exe and hit Enter. Or in the Search type wsreset.exe select Run as administrator.
7) If that fails to fix the problem go to Windows Settings > Apps > Apps & Features to highlight Microsoft Store, choose Advanced Options, then Reset. After it resets, restart PC.
8) If that fails then try everything here:
https://www.winhelponline.com/blog/restore-wind...
If that doesn't fix it then try the Marked Answer here:
https://answers.microsoft.com/en-us/windows/for...
And if that fails install the Add Store (first in list) download from here:
https://github.com/kkkgo/LTSC-Add-MicrosoftStore
or skip to Step 11 below to reinstall WIndows including the Store while keeping your apps, files and most settings in place..
9) Clear the LocalCache Folder: Open Run by pressing the Windows key + R hotkey.
Copy and paste %localappdata% in Run and click OK.
Open Packages> Microsoft.WindowsStore_8wekyb3d8bbwe > LocalCache folder.
Press the Ctrl + A hotkey to select all content within the LocalCache folder.
Press the Delete button.
10) Type services.msc in Search box, choose Run as Administrator, from Services tab ensure that Microsoft Store Install Service is started and set to Manual, if not restart PC.
Alternative methods to work through the above steps here:
https://www.youtube.com/watch?v=WR1fux9Q9O4
11) Next do everything in Step 10 of this checklist:
https://answers.microsoft.com/en-us/windows/for...
12) If nothing else works then do a Repair Install, by installing Media Creation Tool, open tool and choose to Upgrade Now. This reinstalls Windows while keeping files, programs and most settings in place, and is also the most stable method to advance to the latest version.
https://www.microsoft.com/en-US/software-downlo...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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