From the user interface perspective, Atlassian cloud products (such as Jira, Confluence, or Bitbucket) seem to be tightly integrated. In fact, these are separate products sharing a single user base (your Atlassian Account).

Under the hood, you have a separate grant for each product in the cloud family. This allows the built-in Jira plugin (accessible via /j shortcut) to give you access to Jira issues without any additional steps.

Unfortunately, as an Atlassian Marketplace Plugin can not use these existing grants. This is true for all cross-product plugins on the marketplace.

This is why each user has to authorize the plugin and allow it to access her Jira issues.

Luckily, this is a self-service operation that each user has to perform only once.

Linked article:

How to authorize Smart Jira issue view for Confluence?