I have the same issue and have a case open with VMware but have received little to no response. It looks like something to do with metadata from the STS... Either that or something causing that exception... I am seeing this in the error as well... The VMware tech seemed stumped on this one...
Caused by: org.opensaml.saml2.metadata.provider.MetadataProviderException: Metadata for issuer https://servername.domain.com:7444/STS wasn't found