I'm having the same issues as above, you can still access the channels that work though. Play the channel from the fubo site, inspect the page & identify fubos channel ID for said channel then copy a url from a channel that the docker has pulled & swap out the channel IDs.
As an example the url for the stream of NFL RedZone I am able to recreate & use is http://serverip:7777/fubo/watch-hls/75963 with 75963 being Fubos channel ID that I was able to find & replace from a working stream URL but when I download or plug in my playlist RedZone doesnt download or import from http://serverip:7777/fubo/playlist-hls.m3u
I did this for each channel I cared about having but was missing from the docker pull, created my own playlist for the missing channels & just added them separately