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debian install on multipath lun

I have problems installing debian 11. I have a fujitsu blade with only lun fc for OS installation. the problem i am having is due to the mutipath. there are 4 connections towards Mon. 4 devices are then displayed in the installation fse. we tried following the debian guide to enable multipath support
install disk-detect/multipath/enable=true
https://wiki.debian.org/DebianInstaller/MultipathSupport

but after that we can’t find the device which is pointed to /dev/mapper/mpath during installation. We also tried to install a rocky linux, and in this case there is direct multipath support and the installation works correctly. Has anyone had a similar problem how did you solve it?