Session variable value is getting null in ASP.NET Core

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For ASP.NET Core 2.1 and 2.2

In the ConfigureServices method of the Startup class, Set options.CheckConsentNeeded = context => false; as follows:

services.Configure<CookiePolicyOptions>(options =>
{
  // This lambda determines whether user consent for non-essential cookies is needed for a given request.
  options.CheckConsentNeeded = context => false;
  options.MinimumSameSitePolicy = SameSiteMode.None;
});

Problem solved!

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