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The composer blocks scheduling rather than letting a post fail at publish time. The common causes, in the order they occur:

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A required setting is empty

Some platforms need more than text. TikTok needs a privacy level; Reddit needs a subreddit; YouTube needs a title. The channel’s settings tab shows which field is missing.

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The post has no media

Instagram and TikTok will not take a text-only post. Attach an image or video.

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Over the character limit

Shown per channel. When several channels share a global draft, the lowest limit governs — tailor that channel separately rather than shortening everything.

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The channel needs reconnecting

An expired token blocks scheduling to that channel. Reconnect from the channel menu.

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Over the API

The API applies the same rules and returns 400 with the failing fields named:
Two ways round it while you assemble a post: create it as a draft, which skips validation entirely, then call /posts/{id}/missing to see what is outstanding.