This post is a contribution from Pavan Kumar, an engineer with the SharePoint Developer Support team Recently worked with a customer who had deployed a Provider hosted App to their Sharepoint O365 tenant and the remote web was an IIS website which was OnPremise. The App worked fine for a while and it started to fail after sometime with following error Invalid issuer or signature. at Microsoft.IdentityModel.S2S.Tokens.JsonWebSecurityTokenHandler.VerifySignature(String signingInput, String signature...(read more)![]()
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