Canvas: {Message}:{"Could not validate request."}?

LTI Application does not load error: {“Message”:“Could not validate request”}

Describe the issue I’m in the process of connection our self hosted canvas. We get {Message}:{“Could not validate request.”}.

Following the: LTI Application does not load error: {“Message”:“Could not validate request”} dit not resolve the issue.

In LtiAdvantageLaunch I found this exception:

Could not validate request. Microsoft.IdentityModel.Tokens.SecurityTokenInvalidIssuerException: IDX10205: Issuer validation failed. Issuer: ‘System.String’. Did not match: validationParameters.ValidIssuer: ‘System.String’ or validationParameters.ValidIssuers: ‘System.String’. at Microsoft.IdentityModel.Tokens.Validators.ValidateIssuer(String issuer, SecurityToken securityToken, TokenValidationParameters validationParameters) at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateIssuer(String issuer, JwtSecurityToken jwtToken, TokenValidationParameters validationParameters) at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateTokenPayload(JwtSecurityToken jwtToken, TokenValidationParameters validationParameters) at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateToken(String token, TokenValidationParameters validationParameters, SecurityToken& validatedToken) at Edna.Bindings.LtiAdvantage.Utils.LtiAdvantageExtensions.GetValidatedLtiLaunchClaims(HttpRequest request, String jwkSetUrl, String clientId, String issuer) in C:\Users\lti-user\Documents\LTI-tool\Learn-LTI\backend\Bindings\Edna.Bindings.LtiAdvantage\Utils\LtiAdvantageExtensions.cs:line 46 at Edna.Bindings.LtiAdvantage.Services.LtiResourceLinkRequestClient.GetLtiResourceLinkRequest(String jwkSetUrl, String clientId, String issuer) in C:\Users\lti-user\Documents\LTI-tool\Learn-LTI\backend\Bindings\Edna.Bindings.LtiAdvantage\Services\LtiResourceLinkRequestClient.cs:line 25 at Edna.Connect.LtiAdvantageApi.LtiAdvantageLaunch(HttpRequest req, ILtiResourceLinkRequestClient ltiRequestClient, INrpsClient nrpsClient, Platform platform, IAsyncCollector`1 assignmentsCollector, IDurableEntityClient entityClient, String platformId) in C:\Users\lti-user\Documents\LTI-tool\Learn-LTI\backend\Functions\Edna.Connect\LtiAdvantageApi.cs:line 86

I use https://canvas.instructure.com as Issuer?

[Soloresq]

@leestott Yes, for me that made it work. Yes, the comments in the issue you mentioned helped me a lot.

[pkelders]

Hello,

Thank you for the reply, Next week we will look into this.

Op 20 mei 2021 om 11:19 heeft Lee Stott @.***> het volgende geschreven:

@pkelders

Sorry did the above unblock you if not please contact us via email and we will happy schedule a call @.***

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