Solve This map can not be embedded in Google Maps

Google Maps has a menu to share the link of the map that already opened/customized.
The first one is copied directly to the URL address.
The second is for embedded  in a blog post or website.

Especially for the second option, embedding to website, problem often occur where there is a warning:  This map can not be embedded.

To solve the problem This map can not be embedded, the trick is:
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