When activating new IDP configuration for AuthHub per instruction Updating Your IdP Settings for the Broadcom Transition to AuthHub you run into invalid login error 30:
Misconfiguration on customer's IDP side, which leads to the login attempt not getting a correct response to BRCM AuthHub configuration.
Customer needs to correct IDP configuration on their side.
You may use any free SAML tracer extension on browser where customer is activating URL and spot the exact misconfiguration. If you are not sure please open a support case.