Hello @Marc ATTIAS
Welcome to the Atlassian community.
This is a user community for discussions and questions related to Atlassian products. This specific forum is for the Jira product. Does your question relate to that?
When you say are trying to find the site URL for "your app within your organization", what app are you referring to?
If you are trying to submit a support ticket to Atlassian Technical Support, the URL for that is https://support.atlassian.com. Not that only Administrators of paid subscriptions for your Atlassian products will be able to submit support tickets there. If you are not an Administrator, or if you are using a product under a Free Tier subscription, then you won't be able to submit a support ticket.
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