Signatures are not applying due to "The type 'Exclaimer.DirectoryServices.NoOpBackingStore, Exclaimer.DirectoryServices' cannot be resolved" in the logs

Relevant Products: Signature Manager Exchange Edition

Scenario

You are using Signature Manager Exchange Edition and you are not getting any signatures on your emails.  After reviewing the Exclaimer logs via the Status button, you see the below error.

Resolution

To resolve this issue you will need to make a change to the CategorizerSettings.config file in the Exclaimer ProgramData directory.  To do this follow the instructions below.

1. Close the Exclaimer Console
2. Open File Explorer and browse to C:\ProgramData\Exclaimer Ltd\Mail Disclaimers\Configs3 (Version 2.2.8 and higher) or C:\ProgramData\Exclaimer Ltd\Mail Disclaimers\Configs2 (Version 2.2.7 and lower)
3. Locate the CategorizerSettings.config file 
   
4. Edit this file using Notepad
5. Locate the below line near the bottom of the file
   
     <add type="Exclaimer.DirectoryServices.NoOpBackingStore, Exclaimer.DirectoryServices"
   name="NoOpBackingStore" />
6. Change this to the below
   
     <add type="Exclaimer.DirectoryServices.NoOpBackingStore, Exclaimer.DirectoryServices,Version=<number>, Culture=neutral, PublicKeyToken=1123eb20e0421193"
   name="NoOpBackingStore" />
   
   In the above, replace <number> with your own version.  For example, 2.2.9
   
   
7. Save this file
8. Restart the Exclaimer Signature Manager Exchange Edition services