Hello,
Thank you for posting your question on Microsoft community.
I would like to know some information about the issue so that we could help you better.
Does the issue occur when purchasing any app?
I appreciate you for providing details about the issue and your efforts towards resolving it.
This issue may occur due to corrupt Windows store files or settings.
I would suggest you to try following methods and check if it helps.
Method 1:
Reset Windows store cache and check. Please follow these steps:
a. Press Windows + R keys to open run window.
b. Type the following command in run window and press Enter.
wsreset.exe
If it does not help, use method 2.
Method 2:
Disable proxy and check the issue. Please follow these steps:
a. Press Windows + R keys, type inetcpl.cpl
in run window and press Enter.
b. Click "Connections" tab and then click "LAN settings".
c. Click to uncheck "Use a proxy server for your LAN" box.
d. Click ok, apply and ok.
I hope this information helps.
Please do let us know if you need any further assistance.
Thank you