You need to add the <allow-navigation> tags to your config.xml file if you want to allow navigation for other URLs. The following should work:
<access origin="*" /> <allow-navigation href="*" /> <allow-intent href="*" />
As a cautious word, the <allow-intent> connects the entire network using HTTP and HTTPS, which may not be the way you want it in a production environment. You can check the documentation for more information. Otherwise, if you have other security blocks, you may need to remove them, as they may block Google Maps.
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