No serial port available within octoprint

i was setting up an addtional octoprint pi for a second FF CP2, but in this host i have the issue that the serial port doesn't appear in octoprint.

octoprint on pi one shows both fp2
octoprint on pi two shows none of them

dmesg:

[ 4.731251] usb 1-1.3: new full-speed USB device number 4 using dwc_otg
[ 4.795647] NET: Registered PF_INET6 protocol family
[ 4.801480] Segment Routing with IPv6
[ 4.805317] In-situ OAM (IOAM) with IPv6
[ 4.879400] usb 1-1.3: New USB device found, idVendor=2b71, idProduct=000e, bcdDevice= 2.00
[ 4.886794] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4.886814] usb 1-1.3: Product: FlashForge Creator Pro 2 3D Printer
[ 4.890848] systemd[1]: systemd 247.3-7+rpi1+deb11u1 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +ZSTD +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=unified)
[ 4.894568] usb 1-1.3: Manufacturer: Flashforge
[ 4.894585] usb 1-1.3: SerialNumber: 00000000050C

even it is not an issue of permissions, /etc/udev/rules.d/99-octoprint.rules are configured of flashforge on the pi as well.

any idea what i can have missed on my setup?

thx for ideas.

octoprint-systeminfo-20240227134851.zip (50.0 KB)

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