Licensing of Cambria and Calibri font

Question

Hello,

We would like to use the Cambria and Calibri fonts, but we're not sure about the licensing. Our use case is converting on a server .docx files containing these fonts into .pdf files using a library, so we need these two fonts on the server.
The website https://www.fonts.com/content/microsoft-typography details the Server Fonts license which seems to be what we need:

Server Fonts License: Do you need to install a font on a server to generate items such as PDF invoices, custom business cards, or other personalized products? A license allows your customers to utilize the fonts you have purchased in order to customize the products that you offer, but the fonts cannot be distributed or downloaded from the server.

Is this the license we need? Or is it another one?

If the Server license is appropriate, where can we buy it for Cambria and Calibri? In fonts.com, Cambria is not available in this license (https://www.fonts.com/font/microsoft-corporation/cambria), and Calibri is a 404 (https://www.fonts.com/font/microsoft-corporation/calibri)?

Thank you