OneLogin - HubSpot SAML SSO Verification Error: “This XML file does not appear to have any style information associated with it” (4383054)

OneLogin - HubSpot SAML SSO Verification Error: “This XML file does not appear to have any style information associated with it”

When configuring SAML SSO between OneLogin and "HubSpot", administrators may encounter a verification error in HubSpot stating that the XML file does not appear to have any style information. This issue occurs during the SAML metadata verification step in HubSpot and prevents SSO from being validated.

Symptoms

HubSpot fails SAML verification
Error displayed in HubSpot:

“This XML file does not appear to have any style information associated with it. The document tree is shown below.”

Occurs during the Verify step when uploading or referencing OneLogin metadata

HubSpot incorrectly reads the SOAP binding URL from the OneLogin metadata instead of the required HTTP‑POST ACS (Assertion Consumer Service) URL. As a result, HubSpot attempts to validate against the wrong endpoint and fails SAML verification.

After successful verification, customers should coordinate internal rollout and user migration activities. If issues persist, follow the official OneLogin HubSpot SAML configuration guide or contact Support. Configuring SSO for SAML-Enabled Applications >> https://onelogin.service-now.com/support?id=kb_article&sys_id=ae7b78451b6606509a47ec29b04bcb15&kb_category=50984e84db738300d5505eea4b961913 Configuring SAML for HubSpot >> https://onelogin.service-now.com/support?id=kb_article&sys_id=5b4f8568976ded10c90c3b0e6253af25&kb_category=b43085e897e9ed10c90c3b0e6253af3b