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I'm trying to enter 34,000 and Turbotax errors out on the state review telling me it must be reduced. It even shows the state form which says (Limit $18,000 per beneficiary, per taxpayer-spouse). Thus the limit is $36,000 if filing jointly.
Confirmed on PA 529 website: "Effective January 1, 2024, the federal annual gift tax exclusion will increase to $18,000 for a
single individual ($36,000 for married couples filing jointly)."
https://www.pa529.com/pdf/gsp/GSP-Disclosure-Statement.pdf

I took a look at your tax return and see the issue. The issue is limited on a per person basis. Once you remove the full amount from one person and split it between you, the program will properly compute.
I have added screenshots of what you have and what you need to do.

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