The following error is displayed due to authentication misconfiguration on StoreFront:
Cannot Complete Your Request

Complete the following steps to troubleshoot this issue:

1. Open the Citrix StoreFront management console > Stores > Manage Authentication Methods and make sure user name and password is enabled. To enable it, check the User Name and Password box and click OK. NOTE : If you are passing authentication from the Gateway, make sure HTTP Basic is not checked.
2. On the Citrix StoreFront management console > Stores > Manage Receiver for Web Sites > Click Configure. Under "Authentication Methods" make sure that User Name and Password is enabled. To enable it, check the User Name and Password box and click OK.
3. In Active Directory confirm the User Logon Name matches the User Logon Name (pre-Windows 2000). For more information refer to article - User Name Formats.
4. Go to StoreFront Server > Event Viewer, verify if there is error
   -    Event ID 8 "An unexpected error occurred storing the credentials" or 
   -    Event ID 3 "An error occurred during authentication" 
   If yes, run the following PowerShell command and then restart the Citrix Credential Wallet Service:
   cd 'C:\Program Files\Citrix\Receiver StoreFront\Scripts'
   $certlist = @(Get-DSCertificate)[0] | where { $_.Subject -Match "Credential Wallet Replication Identity" }
   foreach ( $cert in $certlist ) { Add-DSCertificateKeyReadAccess $cert "NT Service\CitrixCredentialWallet" }

Problem Cause