Hi,
Please check that the GitHub account is properly authorized and that Trello has the required permission to access your repositories. If the repository list is not loading when you try to select one, reconnecting the GitHub integration is usually the first thing to try. Also test with another browser or in an incognito window to rule out a browser cache or extension issue. If the problem continues, it may be an integration-side issue and Trello support may need to review it.
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