It is to enable authorities to properly document your visit

Missions only handle renewal, replacements and new passports for the children of Ugandans in the diaspora. 

Ugandan machine-readable passports will no longer be valid for international travel after April 4, 2022, and will be replaced by international East African e-passports.

Dual Citizenship for Indigenous Ugandans is 200USD, down from 400USD previously.

In future once the system has been rolled out to all missions it will be possible

It is a new system that is gradually being rolled out to the other Immigration Stations and is currently only available at the Immigration Head Office in Kampala