I don't use Outlook anymore but a friend could not start Outlook without admin.
He then could not drag/drop into email.
I disabled addins but it didn't help.
The only way I could fix it was starting Outlook in safe mode.
3 Ways
1. Run Box > outlook.exe /safe
2. Press and hold the Ctrl key, then select the Outlook shortcut
3.Make Shortcut
“C:\Program Files (x86)\Microsoft Office\root\Office16\OUTLOOK.EXE” /safe
Location Program Files or PF (x86) depends on if 32 or 64 bit version
I could not get the shortcut I made to work and was short on time so gave up.