ok ok It seems i was mistaken some lol BUT
No, there is no evidence that 3I/ATLAS has sent a signal, but some scientists, like Avi Loeb,, have proposed that it could be the source of the 1977 "Wow! signal". This is because the signal and the comet's trajectory at that time were in alignment, but the idea is speculative and lacks evidence of a signal being sent by 3I/ATLAS itself.