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Unfortunately, the Unique ID widget value cannot be used as an output to a text box or in a calculation.
May we know how your form works? We might have a workaround for you. But let me forward this to our widget team as a feature request, but I'm unable to guarantee that this will be implemented anytime soon.
This is not possible unfortunately. The IDs are generated when a form is submitted. If they were generated when a form is served there would be gaps between IDs which most people do not want. This would happen because people loading and not completing forms is a very regular occurence. It would alse mean that if two people loaded the form at the same time but one took longer the IDs would be out of order:
user A loads form gets ID 1.
user B loads form gets ID 2.
User B then submits the form befire user 1, the IDs are out of order.
I hope this answers your question, please let us know if not.