Hi Kozmo Eclipse,
I understand you'd like to access your Activision account, but your Xbox Live account that was linked to it is no longer accessible. Based on the information provided, it's important to note that Activision accounts and Microsoft/Xbox accounts are managed separately, so Microsoft does not have access to Activision account credentials or account recovery options.
If you still have access to the email address associated with your Activision account, try signing in directly through Activision's account portal and use their account recovery options. Once signed in, you may be able to review or update linked platform accounts.
If the account was only linked through your Xbox profile and you can no longer access that profile, the best next step is to contact Activision Support directly. Their support team can verify account ownership and assist with account recovery or account-linking questions that are specific to Activision accounts.
I hope this helps point you in the right direction.
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