Error found in the STS Server logs: System.IdentityModel.Services.WSFederationMessageException: ID3014: Unrecognized Action name: 'wsignin1.0,wsignin1.0' (4265719)

It is not believed that this error impacts Cloud Access Manager functionality and therefore it can be ignored.

It's believed at this time that it has to do with RPSTS -> RSTS WsFed request-response flow, response is not being parsed by RPSTS.
It may be that the "wa" query param and body param might be being collated resulting in duplication of the value.

Product Defect ID # 772505 has been raised to address this issue in a future release.