When the regional settings has the financial number format set to a comma instead of a decimal, statements will not send.
What you can try now
The only work around we have right now is to change the settings so that the financial numbers use a period instead of a comma
Resolution for 'Cause Statements issue: 'Regional Settings Cause Statements not to Email' available: Yes.
The Cause Statements issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the Cause Statements issue yourself by looking for a resolution described in the article. If it is a complex Cause Statements issue or you are unable to solve the issue, you may contact us by clicking here or by using other Cause Statements support options.
For more information about resolving issues related to Cause Statements in Quickbooks/QBO or to get support for the issue 'Regional Settings Cause Statements not to Email', click the link below: