Discord error 50024: Cannot execute action on this channel type

The endpoint you called is valid in general but not for the type of channel you passed. Discord has more than a dozen channel types and many operations are type-specific: you cannot start a public thread from a message in a voice channel, set available_tags on a text channel, follow a non-announcement channel, create a stage instance in a voice channel, or set a bitrate on a text channel.

This differs from 50008, which is specifically about sending messages where messages are not allowed. 50024 covers every other type mismatch. It is the code you get when a user picks a channel from a dropdown that was not restricted by type, or when a feature built for text channels is pointed at a forum.

{
  "message": "Cannot execute action on this channel type",
  "code": 50024
}

Encode channel-type capabilities in one table in your code (which types accept threads, webhooks, slowmode, tags, and so on) and consult it before calling the API. Validate user-selected channels against that table at option-parse time so the error never reaches Discord.

Type mismatches are configuration bugs, so catch them at configuration time: validate the channel a user selects the moment they select it, against both type and the bot's permissions there. Channel-type fields and their valid ranges are on the Discord limits page; the message-sending special case of this error is 50008.