I was testing this yesterday using multiple accounts, both old and new, both with two-factor authentication on and off. All was working.
And suddenly, today, I'm getting
the same symptoms as mr_bartleboom for all of them.
Something must have changed overnight. Seeing lot of differences between how the server was responding yesterday and how it is today, my accounts must have been migrated to some kind of new server. Seeing new EU-related headers, I wonder if this is about EU Data Residency regulation. Aren't you all located in EU? I also wonder, if migration might have been triggered by my tests earlier (as I did login to my OneDrive in web browser the first time after months, if not years).
Anyway, I've made basic improvements to make WinSCP compatible with the new server/interface.
But I at least know about one more problem with creating new folders – to be solved the next week.
Issue 2321 – Compatibility with new OneDrive WebDAV interface
@mr_bartleboom: Can you send me an email, so I can send you back a development version of WinSCP for testing? Please include a link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.