Once you decide to have signatures created automatically, please be aware that the personal information about your users is not added via Signature Generator. Instead, it is automatically taken from your Microsoft Entra ID (formerly Azure AD).
To make it work, you need to have Active Directory filled with valid user data, and this data is synced with Exchange users' attributes. The user data has specific attributes that we can refer to for automatic data import and dynamically manage the signature data.
The following steps will help you to edit the department field in the user’s information.
Open Microsoft Entra admin center with admin credentials.
Browse to Identity > Users.
Click All Users, tap on the user Display name to open its profile.
Click Edit Properties and go to the Job Information tab.
Scroll down to the Department field > type in the name of the department > Save the changes.
Now, you are welcome to proceed with connecting your Microsoft Entra ID (formerly Azure AD) to your Newoldstamp account.