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Apologies for the inconvenience. I tested the "Create PDF Form" feature on my own forms I was able to replicate the issue there. The PDF is not being generated on my test form and on yours.
I will forward this to our back-end team for further investigation. We will update you on this thread as soon as we hear any news. In the meantime, you may check out this guide regarding the fillable PDF form: Fillable PDF - Everything you need to know about JotForm Fillable PDF Creator
The issue should be fixed now. Could you also test it on your side? If the issue still persists, please let us know.