Sorry to hear you are facing problems to create sub-tasks.
The only permission needed to create sub-tasks is the create issue permission independently of the JIRA application you are using, so I believe you might be facing a different problem.
Can you please let us know what are the changes you mentioned?
Additionally, are you using JIRA Server or Cloud? If you are using Cloud, are you using a classic or a next-gen project? The sub-task issues are not available yet on the next-gen projects.
In advance, I suggest you check if your sub-tasks are enabled on your instance by navigating to JIRA Setting > Issues > Sub-tasks
Let us know if this information helps.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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