Can't empty recycle bin!

I am using a Onedrive for Business account with my .edu email, and i find that i can't empty my recycle bin and it is taking too much storage.

I have currently tied using the web page, which doesn't work.

I tried to use the powershell module and ended up with a error saying the object number is over limit (even i am selecting one item by a time).

I tried ios app, dosen't work either.

I do, however, is able to delete files in recycle bin with multiple selection, but it would take me years to get rid of all the small heic files.

I can't find tech support email, my search on google lead me here.

If anyone can provide their insights on this, i will be very grateful.