Sorry for the delayed reply, got really busy for a week.
It seems the topic is closed. Did you wish to reopen it and continue troubleshooting in public so others can maybe use it in the future or continue in private messages like this? It works for me either way.
I just ran some testing and with the same credentials I can access all files with other clients and it still lets me authenticate to add this account with NetDrive3 so I don’t know why that error would be showing up.