If your Jira Cloud has not been prepared by the Admin, the add-in will ask you to login with username and API Token. An API Token is a like a password that allows the add-in to use Jira on your behalf.
The API token is like a password for your Jira account, so please keep the API Token secret and do not share it with anyone else.
Open the following link in a new tab: https://id.atlassian.com/manage/api-tokens
Press Create API Token
You can now choose a label. We recommend something you relate to the Outlook add-in: e.g. Jira for Outlook
You'll now see your API Token - copy it to Clipboard
Back in Outlook, use Ctrl + V on Windows or Cmd + V on Mac to insert the copied token
Once you close the popup with the API Token, you'll never see the API Token again. If you forgot to copy it, you'll need to delete it and create a new one.