I recently upgraded to MacOS Mojave.
When I ran
vagrant up for an existing site (but was new to my machine) I got an error message after entering my password:
tee: /etc/exports: Operation not permitted
mount.nfs: requested NFS version or transport protocol is not supported
There was actually more to the error but these were the two key things I saved.
So easy. We got lucky on this one.
Add iTerm / Terminal to the allowed apps in Settings > Security & Privacy > Privacy > Full Disk Access.
Thanks Ruid Kamphius!