I do not typically write into forums but the quality of this site import/export capability within DNN9.1.1 is so unbelievably low that I am compelled.
We have been wrestling with this capability within DNN9.1.1 for some time now and running into nothing but issues. Currently, created a site and tried to export it. Everything looks fine in the export log, with the job marked as 'submitted'. After that, went to the Scheduler and said to 'Run Now' the import/export scheduled job. The message appeared saying it was scheduled for immediate execution. It just doesn't do anything. No errors, nothing in the logs, nothing at all. Looking at the export log, it still stays 'submitted'. Just. Doesn't. Work.
On another site, we were able to run the Export and it at least 'worked', I guess. Permissions were not set properly upon import, templates were missing, pages were missing, modules were missing, but at least the scheduled job ran on that one. This Site Import/Export issue in DNN9 is a deal-breaker for DNN9 for us. If I can't get this working, I'll have to go back to DNN 8 for now, until I find a stable platform for us to use.