**Common API key issues:**
**OpenAI API Key:**
- Verify key is correct (no extra spaces)
- Check API credits available
- Ensure billing set up on OpenAI account
- Verify API key not expired/revoked
**AWS SES Credentials:**
- Confirm SES is activated (not sandbox)
- Check IAM permissions correct
- Verify region settings match
- Ensure email/domain verified
**Social Media APIs:**
- Reauthorize app permissions
- Check token not expired
- Verify API access approved by platform
- Review API rate limits