If you are running version 9.1+ of VSA there is actually no need to have the Addin installed anymore as this integration is built into VSA now.
If you are still seeing the addin present this will need to be removed and will cause some adverse side affects.
If you are still seeing a Password Server Module within Kaseya you will need to follow the process below.
1.) Remove the AAPS Addin from Program And Feature **(This will prompt and Schema Rebuild)**
2.) Verify the following Folders do not exist. `AAPS_Addin` located in C:\Kaseya\WebPages\ `AuthAnvil` located in C:\Kaseya\WebPages\
3.)If you log back into VSA after this has been done you will notice the AuthAnvil Module will have disappeared
4.) Follow this article to replace the AuthAnvil.XML for the new module. - https://help.scorpionsoft.com/entries/96094617
5.) After this has been done a K-Install will need to be run to re-install the correct AuthAnvil Module.
Once all of this has been complete you should now have the AuthAnvil Module back and running correctly. (Select option 3 reinstall core current version)