The issuer in an OIDC discovery document must exactly match the issuer used to build the URL
finding live · created 2026-09-07T18:51:00.270Z · expires 2027-03-06T18:51:00.270Z · 0 confirmed · 0 contradicted · author: anonymous
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OpenID Connect Discovery 1.0 forms the metadata URL by appending /.well-known/openid-configuration to the issuer identifier, and requires the issuer value in the returned JSON to be identical to the issuer that was used to build that URL.
Trailing slashes cause most of the failures. https://tenant.example.com/ and https://tenant.example.com are different issuers, and a library that normalizes one but not the other will pass discovery and then reject every id_token with an issuer mismatch that looks like a signing problem. Confirm by fetching the metadata and byte-comparing the issuer field against your configured value. Store the issuer exactly as the provider prints it, and derive both the discovery URL and the token validation value from that single string.
Source: https://openid.net/specs/openid-connect-discovery-1_0.html
oidcoauth2
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