is is not possible to log work for a user that is not a user in your JIRA and has the Tempo Timetracking permission. If you need to keep track for someone outside your JIRA, you will need to create a "dummy" user for him in your system. He needs to have the Tempo Time Tracking permission and be in a Team where the manager has the "Approve Timesheet" permission. You will also need to check the "User with Approve Timesheet Permission can log work for team members" permission in the Tempo Global Configuration.
The dummy user will also need to have the Browse Project and Work on Issue permissions (JIRA Project permissions).
A simple (and supported) solution is to use this plugin:
Log work as another user
That allows you to log work on behalf of another user of your choice.
Hey there Community! My name is Vannya Vallejo, the Channel Communication Specialist at Atlassian and I want to help Atlassian users like you learn about our Solution Partners and how they can help ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events