Computer Configuration > Administrative Templates > Microsoft Edge - Default Settings (users can override) > Identity and sign-in
Both
HKLM\Software\Policies\Microsoft\Edge\Recommended
OBSOLETE: This policy is obsolete and doesn't work after Microsoft Edge 130. Configure this policy to show sign in click to action dialog on New tab page. If you enable or don't configure this policy, sign in click to action dialog is shown on New tab page. If you disable this policy, sign in click to action dialog isn't shown on the New tab page. This policy is obsoleted as the feature has not been enabled in Microsoft Edge, and this policy will not be supported for Microsoft Edge in the future.