Hello @[deleted]
Welcome to the Atlassian community.
Can you explain what you mean by the "Jira site key"? This is not a term I've seen used before.
What URL were you accessing when you first logged in?
It sounds like perhaps you have an Atlassian Cloud account, but have not been granted access to a specific Jira instance. If that is the case, the administrators of that instance will need to grant you access. We are a community of users of our own Jira products, and are not able to grant you access.
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