Get a Certificate authenticated SharePoint context to run Context.Site.CreateSPAsyncReadJob()

Hello,

I was able to successfully create a SPAsyncReadJob and get the manifest.xml file created on azure using the sample here https://gist.github.com/techmadness/484e7de0a7c51e5faf952a79f1eacb85

I then tried to get the context without UserName/Password and instead used a Certificate I uploaded to the same Azure application like this:
var clientContext = authenticationManager.GetAzureADAppOnlyAuthenticatedContext(SiteURL, ClientId, TenantId, Cert, AzureEnvironment.Production);

The context gets created fine but I get a 401 Unauthorized when trying to create the SPAsyncReadJob on the site.

Can you please advice how to get a authenticated context to create SPAsyncReadJob without using UserName/Password and only by using ClientID/ClientSecret/Certificate.