Hey @surya bhargwa ,
I'm guessing you're looking to contribute on Maven's Central Repository or possibly need to work with Nexus. Sonatype manages both of these projects and while we (Atlassian) provide a Jira Server instance to Sonatype, they handle the administration of that Jira instance.
I would suggest reaching out to Sonatype support mentioning that you're having trouble logging in to their Jira instance. You can reach them using this contact form: https://support.sonatype.com/hc/en-us/requests/new
Daniel | Atlassian Support
You mention you signed up yourself, is that a a customer on the portal or are you an Agent/Developer for specific projects?
If so you might need to go to https://issues.sonatype.org/servicedesk
I assume if you signed up yourself that you werent granted a license yet and havent been added to any projects.
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event