Looking at this answer I see that someone has commented that is having the same issue, and a day of googling hasn't found me an answer.
Win10 (I'm on enterprise here at work) won't allow me as an admin user to create symlinks on a non-elevated Powershell or Command Prompt, though elevated prompts of either flavor work as expected. We have a custom tool written in Python for asset management that heavily uses symlinks that we're porting from OSX/Unix to Windows for a number of reasons. UAC is turned off as shown here, I'm an admin account on the computer. We have not yet tested on a non-admin account because this is a tool both admins and non-admins use daily, and elevated prompts require us to remap our network drives on every reboot.
Here's my security policy showing everyone should have access. Is there something obvious I'm missing?