Hello,
Just wanted to do a quick followup on this to let you know that I'm still investigating this issue.
I will setup a blank container and again manually install AdvancedInstaller to see if this makes any difference, but this has to wait until next week.
How did this go on your end?
I did the same on my end and I can reproduce the issue, somehow.
I am running the /register command and it is hanging, just like you mentioned.
And when I try to create a new object, I get the following:

- Screenshot_169.png (28.86 KiB) Viewed 3806 times
I have two other customers that are reporting the same isse as in my screenshot above.
Although it's not the same issue as yours, I feel like somehow they might be related.
In your case, however, you mentioned that the registering of the product worked - can you please confirm this?
The issue that I have with the other two customers stems from the fact that both run the process under session 0, under the Local Service account.
In our specific case, we do not run the process under that account. However, if I did understand correctly, all processes in a docker container run in session 0 (without UI).
This made me think that the two issues might be somehow related.
Do you perhaps know if the "AdvancedInstaller.com" tool tries to access any specific Files that could be inacessable for some reason?
The only thing that it does, behind the scenes, is that it creates a pipe to communicate with advinst.exe (our executable).
What I still find confusing that you stated it did work on your setup, which should technically be exactly the same based on how docker works.
Yes, I do find it confusing a bit now as well. It did really work, as I've proven with the screenshots previously (the MSI was built, everything worked just fine).
Best regards,
Catalin
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