No longer able to use OfficeDevPnP.Core.AuthenticationManager OR PnP.Framework.AuthenticationManager().GetACSAppOnlyContext

Question

I usually run those command inside my CSOM code to authenticate to Office 365 using ClientId + ClientSecret:-

using (ClientContext context2 = new PnP.Framework.AuthenticationManager().GetACSAppOnlyContext(siteUrl, clientId, clientSecret, AzureEnvironment.Production))

&

using (ClientContext context3 = new OfficeDevPnP.Core.AuthenticationManager().GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret, AzureEnvironment.Production))

But starting from yesterday the above commands are raising these errors:-

Unhandled Exception: Microsoft.IdentityModel.SecurityTokenService.RequestFailedException: Token request failed. ---> System.Net.WebException: The remote server

any advice? i checked the expiry date for the app and it is still valid till july 2021..

Answer 1

Hi @john john ,

Could it be that the SharePoint app-only permissions is disabled for you tenant? You could check it with this command: get-spotenant | select DisableCustomAppAuthentication

And you could run the below cmdlet to enable it: Set-SPOTenant -DisableCustomAppAuthentication $false

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Answer 2

@john john I found this article which may be the reason: https://techcommunity.microsoft.com/t5/microsoft-sharepoint-blog/provider-hosted-app-pha-application-errors-tls-errors-and-401/ba-p/2273611

You can check which TLS and ciphers are used.