Hi, thanks for reaching out.
Which version of Outlook you use, like Outlook for Microsoft 365 or Outlook 2021?
To create a distribution list from Excel, first save your file as a CSV with “Name” and “Email Address” columns. Then in Outlook, go to File, select Open & Export, choose Import/Export, and import the CSV into your Contacts.
After the import, open People view, create a New Contact Group, select Add Members, choose From Outlook Contacts, and add the imported contacts. This creates your email list.