Sending, receiving, and organizing email in Outlook.com
@Sarah Hemsworth said
I complete the recover your details form, with as much info as I can (all sections completed). I receive no reply to the submission (so far at 3 full days since submission).
If you never receive any reply to your Account Recovery Request, try using a different alternate email address when you fill in the form. Doesn't have to be one you own. e.g. A trusted friend or relative who can forward you the results of your submission.
Is there anything else I can do as I really need this account?
Read thru the Account Recovery Unsuccessful document to be sure you are doing everything possible.
https://support.microsoft.com/en-us/account-billing/account-recovery-unsuccessful-dc56c3e3-dff0-4ed5-8edb-60290eea6b53
Other than that there is nothing else to try. Microsoft has made the automated recovery process untouchable. No human can exert any influence on your behalf. No human will ever look at your Account Recovery form. The automated process checks only if you have answered the specific questions on the form. Anything else is ignored.
Microsoft Support Agents can not unlock an account, reset your password, or change any Security Settings no matter what documentation you can present.
I am sorry. I know that losing access to your account is more than just an inconvenience, it can cause real hardships. I wish I could give you another answer.