Only admins are able to access Jira. Users are not able to access Jira and not able to see boards under the project.
This issue is from friday (12-feb-2021) and we suspect this is due to recent upgradation happened in jira.
Please help us to resolve this issue.
Do your users still have a license assigned to them? Can you check the product/appplication access?
Otherwise https://support.atlassian.com/contact might be a good path to go as you have a Standard environment which entitles you to support tickets from Atlassian engineers
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