Error catalogueSign-in at the EHR
Server does not advertise PKCE S256
What it means
SMART App Launch v2 requires S256. The server may be SMART v1 only or misconfigured.
Fix
Check the vendor’s SMART version; ask whether S256 is supported.
Check it with smart-doctor
Run your login and smart-doctor ranks this cause against the others, with the evidence it found.
npx smart-doctor check my-profileAlready have the server’s error? Explain it without running anything.
npx smart-doctor explain '{"error":"invalid_request"}'