Check that the field has the right "context" - by default, under Admin -> Custom fields, you'll find it is usually limited to a couple of issue types.
You may also need to check that it is on the create, edit and view screens for the project and issue type (project admin -> Issue type screen schemes)
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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