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Please enter your typo3.org username and password to log in to the bugtracker.
If you still have an ancient bugs.typo3.org account, you can migrate it to your new typo3.org account. When you're logged-in (in the bugtracker), please go to "My Account" -> "Merge accounts" and enter your (old) bugs.typo3.org username and password. All data from that account will be transferred to your new account. When you had multiple accounts, you should merge every account one at a time. You need to do the account migration even if your old bugs.typo3.org username was the same as the one you use on typo3.org.