As the sub-task does not show in the project, you must add this issue type to the scheme.
Please, go to the Project settings > Issue types > Actions > Edit issue types.
On the page that will appear, it will show all the issue types, so just drag the subtask from the right column to the left column and save.
If you face any issue or have any other question regarding this matter, please let us know.
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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