Hi @田中 瑛土
First, we need to confirm if the Microsoft Entra account is connected to Windows when using RCG. As you say you'll check with your administrator.
If it's not connected, then I think it's a limitation with RCG. If it's connected, then I think it's an issue with Edge auto sign in, you could provide feedback to Edge team by pressing Alt+Shift+I in Edge.
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Regards,
Yu Zhou