Time Tracking issues

We are using gitlab for a course. I am having students start doing time-tracking in their gitlab projects. However, I can as the owner add /estimate and its related features, but the students (maintainers and developers) apparently cannot. I don’t see a “setting” for this and I don’t see anything in the documentation (or I missed it) telling us that certain roles can and cannot do time tracking. We are wanting to use the weight like for agile planning poker and /estimate for agile estimation. We are also wanting students to report actual time spent to start talking more about sprint throughput and personal throughput like things.
Any ideas why students are unable to use /weight /estimate, etc?
Thanks in advance.

This is our first semester to try gilab and we are currently on GitLab Community Edition 11.7.5 .