[SOLVED!] That Stack Exchange post was the solution! I had to ask ChatGPT for assistance (e.g., “how do I view the contents of a .crt and a .p12?”, “how do I add a CA to a client cert?”), but it worked. Thanks for your help, @Evkob@lemmy.ca.
I don’t think I would have ever thought that my client cert didn’t contain the CA, especially because when I clicked on the client cert that was installed in GrapheneOS, it showed me a summary that said it did contain a CA! grrrr
(tagging @one_knight_scripting@lemmy.world as he wanted to know the solution)
I run MiniO in Docker. Love it. I’ve never used Garage or Seaweed.