Sometimes DXP builds will start up with an error related to SAML. Examples are in the pull requests below, and Brian Chan reported he has also seen this error locally. This might be a race condition.
https://github.com/hhuijser/liferay-portal/pull/5466#issuecomment-822935142 (Smoke and Upgrades Tests)
- Console Log from one of the failed tests
https://github.com/hhuijser/liferay-portal/pull/5463#issuecomment-822948815 (see PortalSmoke#Smoke)