Can't flash TWRP image on Moto E5+

I try to install a custom ROM on my Motorola Moto E5+. To do that, I'm following this tutorial (and check what is said online on the tools used): https://www.getdroidtips.com/lineage-os-17-motorola-moto-e5-plus/ . So I'm at the step where I need to flash the TWRP image, but it seems to don't work.

$ ./adb devices
* daemon not running; starting now at tcp:5037
* daemon started successfully
List of devices attached
ZL5225HPHW	device
   $ ./adb reboot bootloader
   $ sudo ./fastboot flash recovery ../twrp-3.6.0_9-0-hannah.img
(bootloader) is-logical:recovery: not found
Sending 'recovery' (20972 KB)                      OKAY [  0.851s]
Writin 'recovery'                                  (bootloader) Image recovery failed validation
(bootloader) Preflash validation failed
FAILED (remote: '')
fastboot: error: Command failed
   $ sudo ./fastboot boot ../twrp-3.6.0_9-0-hannah.img
Sending 'boot.img' (20972 KB)                      OKAY [  0.685s]
Booting                                            (bootloader) permission denied!
FAILED (remote: '')
fastboot: error: Command failed

So I try to use the command: ./fastboot flash recovery ../../Downloads/twrp-3.6.0_9-0-hannah.img (I'm sudo because it doesn't recognize my phone without) and I try to boot with the image as proposed here: https://android.stackexchange.com/questions/211996/cant-flash-custom-twrp-recovery-image-on-motorola-moto-g7-power-phone But it doesn't work either. On my phone, it says "Mismatched partition size (recovery)" when I try to flash. And when I try to boot, it just say download and boot and that it. Btw, I download the file from here: https://twrp.me/motorola/motorolamotoe5plus.html . So do you know what I'm missing and what I need to do? Or even if I'm doing it right? PS: when I'm trying with the official guide of LineageOS, it's doing the same:

$ sudo ./fastboot flash recovery ../lineage-18.1-20220104-recovery-hannah.img
(bootloader) is-logical:recovery: not found
Sending 'recovery' (15432 KB)                      OKAY [  0.666s]
Writing 'recovery'                                 (bootloader) Image recovery failed validation
(bootloader) Preflash validation failed
FAILED (remote: '')
fastboot: error: Command failed

And it's say the same on the phone:

cmd: download: number
cmd: boot
cmd: getvar:has-slot:recovery
cmd: getvar:max-download-size
cmd: getvar:is-logical:recovery
cmd: download: another number
cmd: flash:recovery
Mismatched partition size (recovery)

PS²: I'm not sure if it's recognize in the good way, since, when I try the command sudo ./fastboot devices, it's listed as ZL5225HPHW Motorola Fastboot Interface, but I'm not sure that the Motorola Fastboot Interface is good or not? PS³: Here are some more commands and the output (I made them under the guidance of @alecxs): So here is the output:

$ sudo fastboot getvar unlocked
(bootloader) unlocked: not found
getvar:unlocked FAILED (remote failure)
finished. total time: 0.003s
$ sudo fastboot getvar securestate
securestate: oem_locked
finished. total time: 0.009s

So, what I'm understanding is that my phone is not unlocked? How I can do that?