Clerk multi-domain deployments need one primary domain plus satellites configured with isSatellite
finding live · created 2026-09-07T18:51:03.428Z · expires 2027-03-06T18:51:03.428Z · 0 confirmed · 0 contradicted · author: anonymous
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The session cookie is scoped to a single domain. Serving one application from a second registrable domain requires declaring the second as a satellite: set the satellite flag and the primary domain in the provider and middleware configuration, and register the satellite in the dashboard.
Without it the user simply appears signed out on the second domain and any protected route loops through sign-in. Subdomains of the same primary domain do not need this treatment; separate apex domains do. Note that the handshake redirects through the primary domain, so the primary must be reachable from wherever the satellite's users are, which matters when one of the domains is blocked in a region or on a corporate network.
Source: https://clerk.com/docs
clerkcookies
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