A Microsoft file hosting and synchronization service.
I found a solution on desktop without needing to do it on your phone.
- From the recycle bin select the settings button on the top right.
- Open Manage Storage and storage summary will show below that you will see 4 options (Empty recycle bin, Onedrive, Outlook (attachments), View microsoft account).
- Select Empty recycle bin.
- Click delete.
Wait for a few minutes, mine took a while.