Followed Citrix recommendations to configure Scanner on XenApp7.6, need assistance to achieve the same.

WIA service was in a disabled state. Twain redirection policy not enabled. As per http://support.citrix.com/proddocs/topic/xenapp-xendesktop-76/xad-xaxd76-knownissues.html
"TWAIN redirection fails on hosted shared desktops and applications. This is a third party issue related to TWAIN applications that require TWAIN binaries to be located in certain paths. [#300854, 340999]

As a workaround, on your Windows Server 2012 machine running the VDA, copy these files to the following locations:

• Copy "twain_32.dll" to the "\WINDOWS" directory of the User profile (for example, copy twain_32.dll into the folder: "%USERPROFILE%\Windows\").
• Copy "twain_32.dll.mui" into the "\WINDOWS\en-US\" directory of the User profile (for example, copy twain_32.dll.mui into the folder: "%USERPROFILE%\Windows\en-US\").

"
Placed files in user profile, scanner worked fine.

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Problem Cause

Policy/Service/Known issue

Followed Citrix recommendations to configure Scanner on XenApp7.6, need assistance to achieve the same.

http://support.citrix.com/proddocs/topic/xenapp-xendesktop-76/xad-xaxd76-knownissues.html