I reported this issue on 13th of March (here). Downgrading indeed 'resolves' the issue.
Now I'm getting the 'please upgrade Power BI Desktop' messages, I just followed the installation process again and still have the issue. Version 2.56.5023.1021 64-bit.
I will downgrade again and hope to get full resolution in the next release. Sharepoint/OneDrive is a Microsoft product and PowerBI should work well with that.
Note the issue is not only returning Error, but also having datetimezone offsets due to wrong assumptions on the datatimezone returned in the Date Modified field of Sharepoint.Files API... I would be glad to get rid of the work around to transform the information returned to get it matched with the datetime in UMT (or my timezone CET)...