Comment 3 for bug 1951958

Getting the exact same issue. Couldn't launch instance and create volume from Horizon web UI, but using CLI I could do that.

Error: Failed to perform requested operation on instance "12", the instance has an error status: Please try again later [Error: Build of instance 6233e0ae-37a2-4bc2-bd9d-c47dff9cce47 aborted: Invalid input received: Invalid image identifier or unable to access requested image. (HTTP 400) (Request-ID: req-01a25693-8cf4-4ce5-b56b-bcef896088fe)].

CLI:

microstack launch ubuntu_20.04.2 -n ubuntu -f m1.medium
Launching server ...
Allocating floating ip ...
Server ubuntu launched! (status is BUILD)

Access it with `ssh -i /home/bibmaster/snap/microstack/common/.ssh/id_microstack ubuntu@10.20.20.202`
You can also visit the OpenStack dashboard at https://10.20.20.1:443

I had the same problem about one year ago I installed OpenStack and I find the solution and fixed it, now I couldn't remember that solution.