There are a number of old questions about this not being supported.
Has this changed?
Being in the process of evaluating the cloud version in preparation for migration from server to cloud, I was able to import keys with numbers from my server backup.
That was what I thought. Does mean a lot of the documentation is out of date, for example:
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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