[SOLVED] GA4: Geographic Data showing "(not set)" when event is sent using Measurement Protocol

I send events through Measurement Protocol and I have no problem obtaining the data from the custom dimension′s parameters.

However, the data for "City" and "Country" are just displayed as "(not set)" for all the events I have sent until now.

Does anyone have any idea why this is happening? Thank you in advance.

I missed this information from the site.

Geographic information is only available via automatic collection from gtag, Google Tag Manager, or Google Analytics for Firebase.