It appears that you are experiencing an issue when trying to create new users in the Microsoft Bookings platform, both on the older version and the new version. The error message "please try again later" suggests that there may be a temporary issue with the service or a problem with your internet connection.
It's also possible that there may be a problem with your Azure AD tenant or the permissions assigned to the user account you are using to create new users. It's worth checking the Azure AD tenant to ensure that the user has the necessary permissions to create new users in the Bookings platform.
Another possibility could be a problem with the Microsoft Graph Customer Booking API, it may be helpful to check the current status of the API to see if there are any known issues.