Hi,
I have added a text for validation,
it works if we put that text in individual validation tab , but does not work with global validation.
By default, global validation applies on specific content type like text/html and text/xhtml.
So if the content type of your response is none of the one above it will not work.
You can add another content type in the NeoLoad preferences --> Project settings tab-->Runtime parameter.
But be careful by setting a global validation it may increase the CPU/Memory usage of your load generator.
You should prefer a validation on a specific response if it's possible.