Edit guest information
You can edit guest information from the Microsoft 365 admin center or the Azure Active Directory portal.
Guest users in the Microsoft 365 admin
To edit the guest information in the Microsoft 365 admin center, select Users > Guest Users.
Select a user from Guest users.
In guest user information, select Manage contact information.
Edit any fields that you choose except for Display name in Manage contact information, and then select Save changes.
You can also edit the guest from the Azure Active Directory portal.