Errors that start with "GRN_OAUTH_" are displayed when errors relating to OAuth occur.

• Cause
  Specification of the OAuth authorization server that your provider supports may be changed.
• Countermeasure
  Contact your system administrator.

• Cause
  OAuth authorization was rejected.
• Countermeasure
  Try OAuth authorization again.

• Cause
  A failure may have occurred on the OAuth authorization server that your provider supports.
• Countermeasure
  Contact your system administrator.

• Cause
  A failure may have occurred on the OAuth authorization server that your provider supports, or the specification of the server may be changed.
• Countermeasure
  Contact your system administrator.

• Cause
  A failure may have occurred on the OAuth authorization server that your provider supports, or the specification of the server may be changed.
• Countermeasure
  Contact your system administrator.

• Cause
  Either the specified "Incoming e-mail account" or the account used in the OAuth authorization may not be correct.
• Countermeasure
  Check your entries and try the authorization again.

• Cause
  The necessary access privilege to the e-mail server is not selected in the OAuth authorization.
• Countermeasure
  Try the OAuth authorization again and select the necessary access privilege to the e-mail server.

• Cause
  The account used in the OAuth authorization is not correct, or access to the e-mail server is not permitted.
• Countermeasure
  Confirm that the account used in the OAuth authorization is correct, and try the authorization again.