Covid-19 Test on Departure: Passengers departing Ethiopia must obtain a negative RT-PCR test certificate from an authorised laboratory and be issued with a Trusted Travel (TT) code that can be verified prior to departure. Passengers will receive a text message (SMS) from PanaBios in addition to an email from the testing laboratory and/or from PanaBios with a link to activate their account on Trusted Travel PanaBios. Test certificates without a TT code will not be valid from 1st July 2021.
Также ещё замечу, что TT-код нужен и для въезда, должен получаться через https://globalhaven.org/.