Token request failed error when getting app only access token
Recently I started seeing token request failed error in my job and my provider hosted app. The jobs and provided hosted apps have been working well for a long time and it just suddenly happened. They always failed at TokenHelper.getAppOnlyAccessToken method. Error info: Type: System.Net.WebException Message: Token request failed. After digging around, it looks like there are a few updates on Microsoft to SharePoint, Azure, and AAD. You can see more details from here, https://techcommunity.microsoft.com/t5/microsoft-sharepoint-blog/provider-hosted-app-pha-application-errors-tls-errors-and-401/ba-p/2273611. Essentially, here are the 2 solution depending where is your code located: If you're running your jobs or web applications on a server, you can apply the change to update the TLS and cipher used. See the details for the TLS/Cipher changes in the link above. If you're hosting the provided hosted app in Azure web app, you can update your code instead. You c...