Can you see if this fixes the issue: DEV: Fix username/name mapping for Discord auth by pmusaraj · Pull Request #31494 · discourse/discourse · GitHub? It should pull the name if available from Discord, and default back to the username if it is empty. We could likely make this smarter and only set the name if/when necessary, but the current approach at least doesn’t change existing functionality for users with no display name in Discord.
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