Hopefully someone smarter will chime in but it might be helpful to know more about the environment. I see on your website that this is running on windows 10… Does windows have a native webserver or is it on apache or some other server? I presume to be considered secure enough to store sensitive info, a windows computer has had some major locking down done. Is there maybe a firewall or something local blocking access?
Unless otherwise configured web services will usually need a port specified after the IP. Most common would be https://192.168.8.185:80 or https://192.168.8.185:8080 but could be anything really.
edit:
I am looking in your post history and I see someone else suggested checking about the firewall SImple Router with DHCP - #5 by eric
My suspicion would be to investigate the host machine rather than the router. I’ve set up things like this and never had to fiddle with the router to get basic functionality.