This is a pretty common ADFS error, and there are all sorts of reasons that it could happen. The stack trace will be this: PLAIN TEXT CODE: Microsoft.SharePoint.IdentityModel.SPTrustedIssuerNameRegistry.GetIssuerName(SecurityToken securityToken) at Microsoft.SharePoint.IdentityModel.SPPassiveIssuerNameRegistry.GetIssuerName(SecurityToken securityToken) at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.CreateClaims(SamlSecurityToken samlSecurityToken) at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.ValidateToken(SecurityToken token) at Microsoft.IdentityModel.Web.TokenReceiver.AuthenticateToken(SecurityToken token, Boolean ensureBearerToken, String endpointUri) at [...]
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