If you get the error when trying to pay for Efile, try turning off your anti-virus programs as they may be blocking connection to the billing server. Here's more info on How to Turn Off Anti-Virus Programs. Sometime going back a couple screens, then returning, has worked.
If this does not apply, when does the error appear? We are tax experts in this forum, not tech support, so it's difficult to diagnose without knowing your system configuration. The Tech Support folks can get into your computer to do this.
Lots of complex returns are filed without issues.
@SHJ1
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