Three different URLs all look like plausible X OAuth endpoints, but only one works. api.twitter.com/2/oauth2/authorize returns a cryptic '215 Bad Authentication data.' api.x.com/oauth2/authorize returns 404. The actual authorization URL is https://x.com/i/oauth2/authorize — the /i/ path is the giveaway. This is undocumented outside developer forums and trips up almost every fresh OAuth integration.
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