Hi @rtor04
Are you following this guide to set Edge as default browser? I have checked this guide and it can work well.
Please run gpupdate /force
after setting the group policy and restart the computer/relogin the user account to make the group policy work. As the guide note says:
If this setting is enabled and the user's device is domain-joined, the associations configuration file is processed the next time the user signs on.
I have tested that if only setting the policy without restarting the computer/relogining the user account, the group policy won't take effect.
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Regards,
Yu Zhou