Hey Simone, welcome to the Atlassian Community!
I've checked some details on your account and am wondering if your question relates to a Server-deployed product. If this is the case, the URL for the product you're using might be something like jira.yourcompany.com vs an Atlassian Cloud product, which would have an address like yourcompany.atlassian.net.
If it's the former and you've got an existing account on something.yourcompany.com and trying to get access to another product at something-else.yourcompany.com, you'll need to contact your company's IT department in order to square away access.
If your colleagues are on an Atlassian Cloud product (something.atlassian.net), you can let them know to add your email address as a new user in their Cloud site.
Cheers,
Daniel | Atlassian Team
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