Hi @Paul Jefferies ,
Currently, it is not supported to directly launch Edge Workspaces using command line. You need to open a workspace from Edge browser.
This command start msedge --restore-last-session
can launch all closed tabs last time.
We recommend that you could submit a feature request to the Dev Team by sending feedback (Press Alt+Shift+I) in Microsoft Edge.
Thanks for your understanding.
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Best Regards,
Raina Zhao