Dear @Kevin Brownlee,
According to your query, I understand that you want to create a contact / distribution list in outlook.
In this case, you can create a contact list directly in Outlook for your own use. In Outlook (desktop or web): Open new Outlook, on the side panel, select People button icon People > Select the contact you would like to add to a new contact list > Add to list by either right-clicking the contact or selecting it from the Ribbon, then select New contact list.
After that, you can simply type the contact list name in the To field when composing an email and Outlook will expand it automatically
For more information, please refer to Microsoft Official Guide here: Create, edit, or delete a contact list (or contact group) in Outlook
Please note this type of list is a personal contact list and is only available to you. It won’t appear in the company address book and can’t be used by other users.
Moreover, if you need a shared or company‑wide distribution group, that would need to be created by a Microsoft 365 administrator in the Admin Center. For more information, please refer to Create distribution groups in the Microsoft 365 admin center
Note: If you are user, please kindly reach out to your IT admin to help you
I hope the information shared helps point you in the right direction. Please try the steps above and let me know if they work. If not, we can continue working together to narrow this down.
The first response may not always resolve the issue right away, but with your help and more details, we can work toward a solution.
Thank you for your patience and understanding. I'm looking forward for your reply.
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