How much content is there? We've had reports from users that the OneDrive API can be buggy with very large libraries, above 10K files.
How many files get imported? Some? None?
The more details that we have on the issues, the easier it will be for the QA/Dev team to investigate.
Please try linking and then unlinking. Then if your OneDrive account still isn't importing, please send us a set of logs.
1. Reproduce the problem.
2. Then immediately go into CloudPlayer Settings.
3. Scroll down to select "Send Log Files" and tap "OK".
4. Enter "DT Issue 20150717a" in the description text and tap "Send Logs" to email the logs to us.