Atlassian took the (rather odd and annoying) decision to turn off JIRA Classic for a lot of Cloud users.
Raise a support request at https://support.atlassian.com and they will re-enable it for you
Hi Stephen,
Please see: https://answers.atlassian.com/questions/14202168 and https://jira.atlassian.com/browse/CLOUD-7806 for more details.
Please raise an issue with us and we can fix that for you.
Cheers,
Clarissa.
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