Proxmox ZFS over ISCSI cannot mount zfspool IO error

Hi there all,
We have 2 proxmox machine with HA cluster and 1 storage structure. 2 iscsi virtual machines have HBA adapter passthrough to connect storage luns. 4 multipath disks can reachable from iscsi virtual machines. On virtual machines there are pacemaker and corosync on Rocky Linux 8.9 OSes for isci target for connecting sharing filesystem from proxmox and on filesystem there are virtaul machine disk files. For unknown reason we cannot reach zfs-pool from virtual machines couse of that we cannot reach virtual machines. When we tried to run zfspool import -a command there is I/O error message returns. Virtual machine can reach multipath disks but cannot reach zfs pool. How can we recover from corrupted zfspool configuration? Command says re-create or recover from backup but there is no backup and re-creation will delete all virtual machines configuration. Could you please help us on this issue?
Best regards,
Aziz

Some screenshots are attached.

zfs5