Thanks ! Coinbase rejected my passport multiple times
If you are living in the US you are not allowed to submit a passport. Read this quoted below.
For US customers, only US state-issued ID such as a Driver's License or Identification cards are accepted. We are unable to accept US passports
Then read this below to help you troubleshoot the problem.
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https://support.coinbase.com/customer/en/portal/articles/1220621-identity-verification