As per the documentation I didn't get output from the given link https://material.angular.io/components/autocomplete/overview
Finally I got the solution one more API has to be add. "ReactiveFormsModule".
For this scenario, You can't mention one more API is required get the output. So please update the document ASAP
Probably best to raise that here - https://github.com/angular/material.angular.io
I think the docs were built assuming that the developer has some previous basic knowlegde on Angular.
Closing as it the developer is responsible for determining which forms module will need to be used.
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