Keyvault access :Certificate give permission to Protected item

Introduction

If you are working with keyvault, ensure you import client certificate with proper permission for it to work properly in your development or local machine. This is most common error and you won't be able to figure out the issues unless you create standalone console app to troubleshoot. The keyvault will always fail at this method and it goes in infinite loop.

public async Task<string> GetAccessToken(string authority, string resource, string scope)
       {
           var context = new AuthenticationContext(authority, TokenCache.DefaultShared);
           var result = await context.AcquireTokenAsync(resource, _clientAssertionCert);
           return result.AccessToken;
       }

Stackoverflow

https://stackoverflow.com/questions/34812897/how-to-suppress-an-application-is-requesting-access-to-a-protected-item-popup

Important Note:

Web application may not prompt you with above security pop-up unlike console application.

Fix/Workaround

Run ->type  MMC

Go to your user personal certificate and delete existing certificate that is application specific and import again with below checkbox status in place.