Our AAOD IVR started getting the following error (no changes were made to the application):

com.avaya.sce.runtimecommon.SCERuntimeException: Invalid runtime license
at com.avaya.sce.runtimecommon.SCESession.throwRTException(SCESession.java:2080)

It appears that the problem is not with the license, but actually getting
to the license server. We found that there was an expired certificate on
the license server. A new certificate was locally created and installed on the
license server (PKCS12 format (.pfx)).

Our question is what now needs to be done on the WAS server which is running the
IVR application? Does the same certificate need to be installed there,
and if so, where? Any updates required for ddruntime? Thanks very much for any help.

If you are using https to access the license server, you would need to update the certificate. By WAS, do you mean the IBM Websphere? For websphere, you need to upddate the certificate using its console. For Tomcat, you would update the certificate in the keystore that runtimeconfig is pointing.