Hello @Huy Nguyen
Welcome to the Atlassian community.
Atlassian has been cleaning up Organizations where there has been no activity for an extended period of time. However, if you had product subscriptions under that Organization and you were still actively using the products, those subscriptions would need to be deactivated first. If that was the case you should have received warning emails that was going to occur long before the Organization was deleted.
Did you have active product subscriptions under that Organization? When was the last time you accessed those products? Did you receive any messages that the products were being deactivated? Have you confirmed that you actually no longer have access to the products?
If you still have access to the products then the Organization that was deleted may have been another Organization you set up at some time where you no longer have active products.
Let us know the answers to the above questions. If it turns out you still have access to your products under another Organization, then do you really need the deleted Organization still?
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