Hello @rob250, Welcome to the /e/ users forum.
Not sure to address pecisely to you question regarding to : “the folk at Fairphone”,
but you can follow this :
[HOWTO] a Clear Guide to install "IMG-e-builds" when /e/ web installer fails
Edit :
Is your question related to this issue ?
New FP6 installing /e/ - Fairphone 6 - Fairphone Community Forum