If you an admin of Jira you're using, you can ask Jira itself in ticket.
Please follow screenshots below;
1-) Go to Admin button next to action buttons and click on "Where is my field?"
2-) Type the custom field name and Jira tell you what prevents you to see the field on screen.
It is a easiest way I believe.
Hope this helps you.
It means you did not enter a value for the field on creation.
According to the comment of you on above, I see you are unable to see it on create page, so you should add the field to create screen in Project Settings > Screens menu or directly screen panel page in admin menu.
We can redirect you if you do not find the related screen. Please check this out first.
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