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It is really hard to say what is going wrong here without seeing it but i still think that something is wrong with Security Rules, routing, ssh key pair or Internet Gateway.
Please review everything against our official guides.
i recommend that you destroy the environment and redeploy it and following this guide https://docs.paloaltonetworks.com/vm-series/9-0/vm-series-deployment/set-up-the-vm-series-firewall-o...
or use the following script https://github.com/wwce/aws-cft/tree/master/AWS-Ref-Architecture
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