WAC : Installation fails with Unhandled Exception

Hi

Server: 2022 Std, 21H2 20348.2700

Clean build and activated

WAC MSI version 2311

When I try to install WAC I get a message : Unhandled Exception - System.Security.Cryptography.CrypographicException - Access is denied (see screen shot)

I am logged on as a user who is a member of the local administrator group and also Domain Admins.

The installation fails and roles back, any ideas as to what I can do?

Thanks

Ian