The Room Account is used for the calendar in Quicklaunch. This can be Exchange or Google. If using Exchange, it can be accessed by Exchange Web Services (EWS) or by Graph API. NOTE: EWS will be retiring in 2021.
Configure Exchange Room Account
Using a different Exchange Calendar
Migrating from Exchange Web Service to Graph API
Setting up Graph API
https://quicklaunch.ucworkspace.com/en/support/solutions/articles/3000101635-setting-up-graph-api
Setting up a Google Room Account
Setup Zoom Account