The first thing our add-in will ask you for is the Jira URL.
We have technical limitations from Office we have to respect.
The Jira URL must start with https or the system has to be publicly available. If not, a connection to Jira is not possible.
For more information please check the Detailed Technical Requirements for the modern Office add-in.
Jira Cloud
For Jira Cloud, this is relatively easy:
https://your-name.atlassian.net
Jira Server
Jira Server is hosted by your company, so they can basically give it any URL.
If you are unsure about the base URL, the most reliable way is to just copy the dashboard URL from the Jira overview: