Heads up! I took another stab at it this weekend and I found the solution that actually worked, to finally complete the install. As I already had a Debian 12 vm configured, I performed a sudo dpkg-reconfigure passbolt-ce-server
which I derived from this post (Connection refused when doing initial web-based setup after install - #7 by Decoy256 - Look at garret’s post 7). That did the trick!
I’m going to be thoroughly testing Passbolt over the next month to see if it’s a solution that would benefit my enterprise customers!
Cheers all!