Hello,
The flow trace does not show anything out of the ordinary, next step would be to collect PCAPs on both machines, to verify if the ping/ping reply pkts are actually getting there.
Before collecting PCAPs, please make sure
1/ You disable Windows Firewall - if these are Windows machines,
2/ the machines' time is synced to a common NTP server
Then please post the PCAPs to this forum or upload it to any of the public file servers like Google Drive, and share to the community.
HTH
Thx
Alex