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I see my colleague has already forwarded your request to our developers to have a look:
I did test one of your forms and I was able to create a fillable PDF version of it:
Here is the PDF of my clone of that form:
We will update your other thread when we have any further information as to why it is not working from your end. If there is a different form I should test, let me know and I will see what I can to get the PDF working in the mean time.