Exemptions can only be created and submitted departing from Union airports. The scope of arrival airports is wider including also non Union airports.
In the search/dropdown control of Departing airport, the airports published as Union airports are found.
In the search/dropdown control of Arriving airport, all commercial EU airports can be found extended with neighboring non EU airports not much further away than the maximum exemption distance of 1200 km.
See also:
Where can I find the EU regulation implemented by this exemption function?
https://transport.ec.europa.eu/transport-modes/air/environment/refueleu-aviation_en