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Can you also share to us more details about the procedures you have taken when using the Fillable PDF Form.
Which PDF application did you used to open the PDF file and tried to submit?
Please take note that if only used with a PDF reader/software that only Preview the PDF form, it will not submit. (because it is only in Preview mode)
I also was having similar issue when I first test using it.
But after I installed a PDF reader/writer software on my computer, I was able to make it work.
Hope this help. Please let us know if issue persist.
Submit problem occurred because you had custom page. We fixed the issue today, your forms should submit now.