are User licenses required if i have premium license, ?

[Anonymous]

We have a bi report server with premium lisencing deployed in our orgnization. 

We have 10 people will be working to create dashboards and reports on their laptops, using power bi Desktop.

my question is do I still have to buy per user lisence for each dev in my team?

currently i did not find answer so I am using a trial version of Power Bi desktop.

Appreciate your time and help.

regards