And......?
Not failing to exist is not the same as always existing.
I ‘m afraid it does.
Back to mindless idiocy.

Also noted the editing out of most of what I said, presumably because you have no answers to it.
When you and I die we fail to exist, when uranium decays, that entity fails to exist.
Drivel. We fail to
continue to exist beyond a certain time. Having a boundary in time is no different from having one in space. None of this changes the fact that we haven't failed to exist
The universe we observe is a collection of things that have failed to exist...
It's a collection of things that manifestly haven't failed to exist but most of them to not extend through all of space-time. The actual space-time manifold, of course, is the background against which you are trying make silly claims about failing to exist. You are using a physical part of the universe as a yardstick to measure existence, which is actually quite funny considering you're trying to argue for something beyond the physical universe....
...which is why I ask you “What is it about or in the universe that does not fail to exist?”
The whole thing and every single part of it.
At the end of the day this is a rather pointless argument about semantics. It doesn't matter one iota to the foolish nonsense that is the argument from contingency and the illogical, incoherent fantasy of a 'necessary entity'.