mentionedChannels
Parameters
mentionedChannels
Channels specifically mentioned in this message.
Not all channel mentions in a message will appear in mentionedChannels:
Only textual channels that are visible to everyone in a lurkable guild will ever be included.
Only crossposted messages (via Channel Following) currently include mentionedChannels at all.
If no mentions in the message meet these requirements, this field will not be sent.