Dynamic NAT i.e translation of IP address and port number is not supported for IPSec and GRE traffic passing through a PA firewall.
Couple of configuration workarounds
-1) Enable on NAT-T on the IPSec endpoints.
-2) If the IPSec /GRE end points have a public IP addresses, you can create a NAT rule with action no-NAT for the IPSec/GRE. This will bypass NAT for IPSec
if NAT is still required for IPSec and GRE, we do support static NAT or dynamic IP i.e only IP translation and not port numbers.
Hope this helps
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