There may be a problem with the format of the text when pasting it on TV. The signal goes out of TV but it does not correctly detect the url where it should be sent. Since the signal never arrives, nothing is displayed in the error log.
Something that usually makes it difficult to send signals is the format of the webhook text. To avoid this problem:
Enter this link: https://zignaly.com/api/signals.php
Copy it directly from the browser bar, as seen in this image:
After that, paste it on the TV alert box - Webhook URL. (Do not let the browser autocomplete the field).
Note: This may not affect you, it only affects some users, and is related to the type of fonts that that user's pc has installed. In any case, performing this procedure will avoid this problem.