fix(auth): open regional OAuth on the site host - #868
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US3, US5, AP1, and AP2 serve the UI on the site host, not app.{site}.
Prefixing app. sends SAML login to a different browser session than the
assertion consumer, which Datadog rejects. Keep app. only for the bare
UI sites.
Co-authored-by: Cursor <cursoragent@cursor.com>
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srosenthal-dd
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Sep 28, 2026
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LGTM! I did several local tests on a build from the branch and confirmed logins still work as expected on SAML and Google Login, for sites with and without custom subdomains, and sites with and without the app prefix.
amaskara-dd
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Sep 28, 2026
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What does this PR do?
OAuth login for regional sites now opens the authorize page on the site host itself (
https://us3.datadoghq.com/oauth2/v1/authorize), instead ofapp.{site}.app.is kept only for the bare UI sites:datadoghq.com,datadoghq.eu,datad0g.com, andddog-gov.com. API hosts are unchanged (api.us3.datadoghq.com).Motivation
On US3,
app.us3.datadoghq.comandus3.datadoghq.comare different browser sessions. SAML (Entra ID) posts the response tous3, which rejects it with an invalidInResponseTo. The same host layout applies to US5, AP1, AP2, and any other non-bare subdomain.Additional Notes
GovCloud stays on
app.ddog-gov.com. Bits and ACP use the same host helper, so they follow these UI hosts too.Checklist
Related Issues
Closes #855
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