I am having the same issue - I am using a different HAT, but same connection.
Looks like we should be able to upgrade the Yellow with a CM5, pending support from the HASS team:
What we can confirm though is that the Compute Module 5 will share the same dual connectors as the Compute Module 4
Retaining the dual connector should mean that boards designed around the CM4 should work with the CM5. The assumption being that the 55 x 40 MM form factor remains the same.
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I am on a SD card. No tricks.
Will migrate to PCI connected M.2 disk for my production setup.
This is good news! I just hope the HA Yellow is capable of supplying enough power for the CM5. The RPi 5 requires significantly more power than the RPi 4 - thus my concern… 
That is the strange thing about the Rpi5 as Broadcom have seemed to completely killed the energy efficiency of those great Cortex A76 cores.
The HA Yellow says its 12v 2A but guess its all dependent on the onboard regulators.
The comparative SoC Rk3588(s) from Rockchip manages near x2 Gflops/watt over the Pi5.
The similarly priced OrangePi5 due to already have a NPU and much more capable GPU would be my preference.
The Rk3588(s) boards and Intel mini PC’s make the Rpi5 much less of a clear choice than previous gen’s.
Its just a pain that HA seems so hard to port to what is a pretty standard distro and keep wondering why all the custom stuff for what is mainly networking?
Just restored a Pi4 backup to Pi5 using RC2 image on 256Gb NVMe drive connected using the Geekworm X1001 Hat. I’m assuming there’s no real issue running 2 instances of HA?
Such an improvement on boot up speed vs VM or Pi4 with NVMe.
All you need to do is make sure they have different hostnames and it works fine.
Yeah, I haven’t got much in the way of automation yet, just been playing with it for a while until I figure out how I want to run it full time
sorry complete novice here
can Pi 5 run hAOS yet as i have just bought a pi5 with the NVMe Base for Raspberry Pi 5 – NVMe Base and the cooler.
I have pi so on the sd card and the pi4 version of HAOS on the NVME but im getting a not supported error on boot when tring to boot off the NVME.
Is there a way to run it yet?
Sorry for any spelling mistakes I’m Special
there are a few of us with the same issue, welcome to the “specials” 
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Please do not try running the RPi 4 version of HAOS on the PI 5. That will definitely not work. If you are using the official Raspberry Pi Imager tool, you’ll still need to manually download the HAOS image that has been released for the RPi 5, and then select it using the option below.
For now, this definitely works if you boot the RPi 5 off of a microSD memory card, or a USB 3 connected NVME drive. I have not yet seen any successful reports of anyone booting HAOS on a RPi 5 using an NVME hat (i.e. PCI Express connected NVME).
Update: Looks like some users have reported that they can successfully boot HAOS directly off of a PCIE connected NVME drive! This is good news. I have seen some reports that not all NVME drives are compatible with the RPi 5. Do some research before purchasing.
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It worked and is running
however new issue and this might just be me not understanding how it works properly
HAOS is running. can I get the GUI up from the ha > command line?
sorry real novice
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No. HAOS is designed as a headless server. One must use a web browser to configure and manage the platform. The HA Mobile Phone app is also an option. Both work very well.
can you put a head on it?
no… as ogiewon said, it’s all controlled form the web browser or mobile app.
Why would you run anything from SD card with a NVMe hat? Surely the point is you use the NVMe entirely.
I did not the nvme works fine through the pcie
you have to change it to gen 3
so load the pi OS on the sd then and change the setting but works fine.
Hi, have same problem today. with 11.5 rc3 - while connected to USB 2.0 port - HA working good. When connect to USB 3.0 - shows errors on boot, starting with errors with Docker containers.
I don’t understand why you would want to connect over the USB now the Pi5 has PCIE support. Get yourself a NVMe hat and boot directly from that. Super fast and stable.
Just curious… Are you personally running HAOS on a RPi 5 booting from a PCIE connected NVME drive? If so, what version of HAOS are you running?
Previous attempts, noted earlier in this thread, were unsuccessful in doing so. Thus, my curiosity if you’ve achieved with this hardware combination. If yes, please let us know which NVME Hat you’re using, as well as which NVME drive.
Thanks!
Update: Sorry for not searching this thread more thoroughly before I asked the above question. Still curious though… Are your running HAOS on this combination? If yes, what version? If not, what OS are you running on your RPi 5?