How do I provide a key to public users ?

I'm creating a webapp.. I can access it locally but not from remote machine.
Chrome is givin me this error:

Uncaught java.lang.RuntimeException: The Maps API has not been loaded.
Is a <script> tag missing from your host HTML or module file?  Is the Maps key missing or invalid?

What should I look for ? I would be satified if it didn't even require a key..
Is there something I can do about it?

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