BP HUB 5.1.1 : Email Service Install Fail

[KodiSrihari]

Hi Team,

We are Installing the Blue prism Hub 5.1.1.

While Running the Power shell Script , In the "Installing Email Service " Section an error is occurring Installation of : -  EmailService. 

The Email Service Logs shows the below error:- 

Calling custom action BPC.EmailService.Installer!BPC.EmailService.Installer.Actions.CustomActions.ConfigureIISAndRestart
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.Collections.CollectionBase.System.Collections.IList.get_Item(Int32 index)
at System.Security.Cryptography.X509Certificates.X509Certificate2Collection.get_Item(Int32 index)
at BPC.EmailService.Installer.Actions.CustomActions.<>c__DisplayClass6_0.<ConfigureIISAndRestart>b__0()
at WixSharp.Extensions.HandleErrors(Session session, Action action)
CustomAction ConfigureIISAndRestart returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
Action ended 9:18:20: InstallFinalize. Return value 3.
Action ended 9:18:22: INSTALL. Return value 3.
MSI (s) (78:88) [09:18:22:406]: Product: EmailService -- Installation failed.

MSI (s) (78:88) [09:18:22:406]: Windows Installer installed the product. Product Name: EmailService. Product Version: 5.1.1.10. Product Language: 1033. Manufacturer: SS&C Blue Prism. Installation success or error status: 1603.

=== Logging stopped: 8/28/2025 9:18:22 ===

Anyone suggest what caused this error in Audit Service Installation and How to overcome this error.

Thanks,

Srihari 

[expertcr]

I see that error in an installation where SQL is running in a High Availability Group and the certificate required for the SQL was apply only in one server, also the user doesn't have full rights.

We will need to see if that is your case and check if the certificate has all the FQDN for all the notes and the listener.