Why the Google Analytics integration doesn't work?
It's enough to enter the correct property ID associated to your Google Analytics account used to login and authenticate JSitemap Pro.
If you register a 'Google Analytics 4 property', to use it through the API integration just select the predefined 'Google Analytics Data API' and enter the GA4 property ID:
The GA4 property ID is available in your Google Analytics account visiting the admin area at top right corner: