It looks like you go support from the Atlassian Cloud support team at https://getsupport.atlassian.com.
The initial answer, in case it helps someone else in the Community, was something like:
> How do I know or check that my email is an Atlassian account? How do I check other users?
- You can try to login to this page: https://id.atlassian.com
If you can have access to it, you have an Atlassian Account.
> How to bulk upgrade users based on your new policy?
- Unfortunately, it's not possible. To upgrade to an Atlassian account, your users follow a simple upgrade process.
The support team also recommended reviewing:
Atlassian account for administrators
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