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Title
OneLogin - HubSpot SAML SSO Verification Error: “This XML file does not appear to have any style information associated with it” -
Description
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
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Cause
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.
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Resolution
- Log in to HubSpot Admin.
- Navigate to Settings → Security → Single Sign-On.
- Locate the ACS / Reply URL field.
- Ensure the ACS URL uses the HTTP‑POST binding, not the SOAP binding.
- The HTTP‑POST URL can be found in the OneLogin app’s SSO configuration.
- Save the changes.
- Re-run SAML verification in HubSpot.
Once the ACS URL was corrected to use HTTP‑POST, SAML SSO verification succeeded, and the authentication functioned as expected.
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Additional Information
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