I'm not able to login to the Atlassian account as its prompting to enter the security key which is not available in the system. Also, the emergency recovery key is also not available.
Here on the portal we can't grant access to instances. This is a public community forum for users of Atlassian product to help each other, but we can't access instances or grant access to instances.
Not even official Atlassian Support will honour such a request.
You will need to contact an admin of the instance or the IT department of the company the instance belongs to.
This document has information about recovering your account:
...and that document includes a link to this document:
https://support.atlassian.com/atlassian-account/docs/login-issues-related-to-two-step-verification/
The section you need to review is:
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