Now, resolved the invisible reCAPTCHA issue following below steps!
Issue - Please upgrade to a supported browser to get a reCAPTCHA challenge.
Alternatively if you think you are getting this page in error, please check your internet connection and reload.
Stayed Informed - Google's Invisible reCAPTCHA in ASP.NET MVC 5 Using Action Filters
Solutions - Previously I am using the bundling concepts to render the Google invisible reCAPTCHA APIs scripts i.e.
bundles.Add(new ScriptBundle("~/bundles/recaptcha", "//www.google.com/recaptcha/api.js").Include("~/Scripts/recaptcha-api.js"));
So, the above invisible reCAPTCHA API scripts is not rendering with secure https port (https://www.google.com/recaptcha/api.js'). It’s simply render non secure port (http://www.google.com/recaptcha/api.js'). So Google invisible reCAPTCHA not processing your request successfully!
Now, I am using the below line of code to rendering reCAPTCHA API scripts i.e.
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