Hi,
The link which I provided had the NAT troubleshooting, however I wanted you to configure security flow traceoptions after referring that link and not troubleshoot nat.
The security flow traceoptions would be able to provide us the details if the traffic getting encrypted and sent into the tunnel or not.
It would also let us know about the replies after they get decrypted.
Regards,
Sahil Sharma
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Please mark my solution as accepted if it helped, Kudos are appreciated as well.