Hello,
Firstly, thank you for this interesting ROM.
This being said, I just found that cdn.signal.org/cdn2.signal.org are blocked by default and maybe it shouldn’t, because it blocks the pairing process (with a desktop Signal app). I also think that those CDNs might be used for sending media content. It’s not really an issue because you just need to “unblock” Signal, but when you are a newcomer to iodéos it might not be very clear why SIgnal won’t work as expected.
Best regards