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The usual reason would be that they are using Atlassian software to do support and you have a reason to contact them and raise issues or read some of the internal documentation.
But most people who do this would do it with Jira Service Management, making you a "customer" who would not necessarily need an Atlassian account.
Could you tell us where they have directed you to and how?
@[deleted] welcome to the community,
First time I'm hearing about this. Imo, it shouldn't.
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