Hi Martin,
This issue you are experiencing is due to wrong configuration of rabbitmq, please reconfigure It and check again.
also you can change the export settings to XML and check if you can retrieve the output as an excel file.
Best Regards,
Jeevan Rangaraju
Jeevan Rangaraju - AD01 Certified RPA Professional
Associate Consultant
Ernst & Young LLP
Bangalore, India
Email - jjeevan152@gmail.com