Were you able to look at the logs?
I have the same problem.
Did you fix it?
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I ready Something about problems with the SSD USB Adapter so I ordered a new one which I will try this week
Any update to this problem. I have the same issue unfortunately.
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Same problem here 
I guess the USB Adapter is not the problem since I ordered one of the recommended ones for the RPi4
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A full restart (of the machine not just HA) fixed it for me.
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I have exactly the same problem after SSD migration. Addons are greyed out and seems not to start/work. In my case ZWave isn’t working anymore and I’m not able to open the config page, but also file editor is unable to open. On the other hand: Ngix proxy manager seems to work (although it is greyed out in the add one page). What’s going wrong?
I noticed some difference. On my SD card 32bit was running, on the SSD 64 bit. So I reinstalled SSD to 32 bit and restored the 32bit backup. Unfortunately: addons keeps grey out.
Good to mention: before restoring the SSD (empty installation), addons on the SSD are working! I can not imagine the SSD USB adapter is part of the problem. It must have something to do with the restored data…
Seems like this worked for me aswell.
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Didn’t do the full restart (of the machine not just HA) yet?
iave the same issue,
tyed multiple waya.no addon working evne they are installed.
Same here,
Running RPi4B8, SD card no problems with HA or addons.
All IP’s in my network are fixed, nothing changed between SD and SSD is…the switch to SSD
So…
Wanted to start using Influx and Maria and such, so crucial SSD on a SATA-USB3 connector.
Did the whole spiel of installing bare HA on the SSD, than putting the util on a spare SDcard.
Plugged in the SD card, power-up, green screen
Power off
Plug in the SSD, boots.
Login in and the restore to the pre SSD backup.
System comes back up…
no addons, all greyed as described.
read here, hard reboot.
not even completed booting, after waiting for HA CLI, message Docker Deamon not running…
So now I just chucked the SDcard back in…took the system longer to find SDcard but, no problem booting…works as a dream…
Any clues here?
Luckily switching from SD to SSD is a ontime action…installed all add-on again…now it works.
BTW, when having trouble getting a SSD to boot, try a different USB port. And do not change the port after.
It worked for me too. Thank you for the solution. 
Thanks! This worked…
Could you solve it to @eric1905? If so and the solution is in the thread feel free to mark it as 
solved so other users can find it easier 
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It worked for me as well. Thank you for the solution. Simple & Efficient !!!
I had also the same issue. All addons grayed out after SSD migration. Switched back to SD and all back to normal.
Then I saw this thread and thought to go through re-installing all addons.
However, to by big surprise, all were running just fine.
So…maybe proper restart fixed the issue?
Legend that worked - thank you! 
Power on & off the Raspi 4 also solved the problem for me, too.
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