I am getting the following error when I attempt to use the workspace option: File > Download the PBIX file
Can't export to Power BI Desktop format
We couldn't export to .pbix format.
I have routinely downloaded this same file in PBIX format.
Unfortunately, I did not encounter the same error as yours after the test.
According to this “Download the PBIX file” feature, the biggest limitation is that you can’t download the report you created in the Power BI service. Here is some other detailed limitation of this feature, you can take a look:
You can try to sign out of your current account and clean the cache of the browser and sign in again to download the pbix file. Or you can try to switch to another browser.
Community Support Team _Robert Qin
Can't reproduce this issue
OK to mark as resolved - the issue is no longer present.I suspect it was related to the 365 outages.
Im still experiencing the same problem today when i try to download pbix.