A Microsoft file hosting and synchronization service.
Everyone who is hit by this bug/issue please report it to Onedrive support.
Without reporting it they will do nothing.
More report, more pressure.
Please say that you are not willing to pay for service does not work or is not trustworthy.
Here are other threads with this: https://answers.microsoft.com/en-us/msoffice/forum/all/shared-folders-on-onedrive-are-appearing-as-a-link/581e271b-6c49-47e3-84fb-5fbd69cbceca
Spam MS Support. They will say that they know about this issue, but keep pushing them.