Hello
please i need to block microsoft store , any suggestions
It's more recommended that you manage the access to the Microsoft Store via Applocker or GPO within your estate. See Microsoft article.
See https://docs.microsoft.com/en-us/windows/configuration/stop-employees-from-using-microsoft-store
it's not possible on SEP ?
You could use the Firewall component to block the website addresses/url/domain, but you will need to find out what they are and then testing to ensure it doesn't affect any other Microsoft services that may use these addresses.
I fear to make a problem for the other microsoft services , I wanted to do it by application control, but I did not find the microsoft store process !
Test it on a test machine and work your way through it - this would be the best way to do it before rolling it out to all clients.