Hello,
it seems like you configured it correctly.
Perhaps you left the default selection of protocol as TCP+UDP? That could be a reason why pings are not reaching the end device, as that would require setting the protocol to ICMP or ALL, however, in that case, you will not be able to specify which port to forward unless separate rules are created for ICMP and TCP+UPD packets.
Awaiting your response!
Best regards,
DaumnatasG