I am trying to use PlexConnect with 2 Apple TV's, the first Apple TV can connect to it but the second can't. Does PlexConnect only support 1 client?
No it will support multiple Apple TVs.
Just use the same certicate on each device.
https://forums.plex.tv/topic/112715-adding-a-2nd-apple-tv-into-the-mix/?p=669451
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