docs: improve OAuth error 403 troubleshooting and test user setup#3
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Add troubleshooting section for common Error 403: access_denied issue that occurs when users attempt authentication before adding test users. Changes: - Add troubleshooting section explaining Error 403 and solution - Clarify OAuth consent screen test user configuration steps - Explain "Google hasn't verified this app" warning is expected - Emphasize test users must be added before running gcalcli init This addresses a common setup issue where users encounter access_denied errors because they skip or don't realize they need to add themselves as test users in the OAuth consent screen. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Pull request overview
This PR improves the OAuth setup documentation by clarifying consent screen configuration steps and adding troubleshooting guidance for a common authentication error.
Changes:
- Expands OAuth consent screen setup instructions with more detailed steps, including explicit External user type selection and test user configuration
- Adds troubleshooting section for Error 403: access_denied when test users are not configured
- Updates the OAuth flow warning description to be more accurate and less alarming
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Ported from insanum/gcalcli#869 by @dandaka.
Summary
Error 403: access_deniedWhy
One of the most common setup failures for new users is not adding their email as a test user before authenticating. This doc change surfaces that requirement clearly.
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