Hi, I am new to ET and have a question about Mobile Check in. I am flying three legs

LGW-ADD
then after a stay in ADD
ADD-VFA
DAR-LGW (transit via ADD)

I have downloaded the App and loaded my booking but it says - one of your segments is ineligible for Mobile Check in, go to check in desk.

I am assuming that is to check the Ethiopian Visa (UK passport holder) Manual check in at LGW doesn't worry me.

Question is, am I likely to be able to use Mobile Check in at ADD for the VFA flight - (given that Zimbabwe allows visa on arrival).

Any advice and or experience with Mobile Check in on ET appreciated.