These error messages appear in the log:

main.ERROR: Scheduled product lists update failed. {"exception":"[object] (Magento\\Framework\\Exception\\CouldNotSaveException(code: 0): Produktlisten konnten nicht aktualisiert werden: Error Fetching http headers at ...

main.ERROR: Product lists update failed. {"exception":"[object] (DeutschePost\\Sdk\\ProdWS\\Exception\\ServiceException(code: 0): Error Fetching http headers at ...


The Internetmarke module is enabled but no credentials are configured. Therefore, the Cronjob which tries to update the Internetmarke products fails.


Enter the credentials for Internetmarke into the configuration in Magento.

If you don't want to use the Internetmarke module, you can disable it like this:

bin/magento module:disable DeutschePost_Internetmarke