Can not lock bootloader after installation of Pixel 7 Pro

Hi,
I just have installed iodé on my Pixel 7 Pro with the installer and it worked fine till the “failed” at the end.
At first I was shocked about the “failed” because the complete installation details have been with “OK” and have been successful.

At the end I will paste the Installation details.

Once I have quit the installer the phone started after I pushed the button in the bootloader from the Pixel 7 Pro. So I am in the iodé on my Pixel 7 Pro and it looks fine. I could ignore the “failed” at the end of the installation. Now it comes to my problem: I would like to lock the bootloader but it does not work.

I searched through the web but there is nothing what could help me.
Can you please help me to lock the bootloader?
If this works that I can lock the bootloader and after few month testing the os is stable I could switch from iOS to iodé and I plan to switch the complete family to iodé. I like that complete project.

For the test, if I try to unlock the bootloader, the command works and give the right feedback:

~$ fastboot flashing unlock
(bootloader) device already unlocked
OKAY [ 0.005s]
Finished. Total time: 0.005s

If I try to lock, it failed.

~$ fastboot flashing lock
FAILED (remote: ‘invalid android images, skip locking’)
fastboot: error: Command failed

Can you please help? What can I do to lock my bootloader?

Thx. in advance for your help.

Update: Just found after more research the “maybe” solution that could also fit for me: IodèOS for Google Pixel 6 Pro (raven) - #24 by vince31fr
Maybe someone can help me and give me that key? Maybe @vince31fr have time for that?

Code must be nearly the same, I would need only to get that key and I would need to know what I have to extract and where. Than I would give that solution a try.

“fastboot erase avb_custom_key
fastboot flash avb_custom_key avb_custom_key-cheetah.bin
fastboot flashing lock”

That would be so great! Thx. a lot in advance for your time and help.

I have reached the maximum qty. of changes in my first post, that why I have to write a new post.

Additional information: During my research I have installed Graphene OS just now to get a feeling for that kind of installations. With Graphene OS in the web-installer it works all fine. The installation runs without any errors.
After the installation I could also lock the device without any problems.
So I have re-installed iodé to see if it works now. The non stock key from Graphene I have removed, so there shouldn`t be a problem with it. Still the same behavior of iodé, I can not lock the bootloader. I assumme, this must be something with the installation. I have installed it manually.
The installation file was: iode-6.1-20250303-cheetah-fastboot.zip

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