Joining workspaces through a code is a very good way to join workspaces. And it is rather quite easy. Though keep in mind, joining via code is only available to be used on workspaces without auto-sync enabled.
Joining with a code
To get started with joining with a code, head over to the workspaces page on Hyra and click "Join a workspace"
From there, a popup should appear in the middle of the screen with a textbox, and join/cancel buttons!
From there, insert the code provided by your team and click join! You should then be added as a member into the workspace the code was for!