The permission definitely is granted to the user, but the button is not there in UIv4.

We recently fixed this issue where a user who had SDT permissions were not able to see the icon in UIV4. This fix should be available in an upcoming release for the UIv4 beta (no date set just yet).

Users with SDT permission in uiv3 don't have an "add sdt" button in UIv4 | Open Beta UIv4

Discussions

Users with SDT permission in uiv3 don't have an "add sdt" button in UIv4 | Open Beta UIv4 | LogicMonitor Community