Setting up both a public and secure share on the same Samba server

Running RHEL 7 / Samba 4.10

I have two different shares on this server. I need to make one publicly available to everyone on the network and one password protected.

A lot of the articles I've found on how to do this seem to want you to set up a global parameter of security = share but Samba 4 doesn't support that option, it appears to be a Samba 3 thing.

I had this working for when there was just a private share just fine. I set map to guest = never and then created a linux user smbuser and then did smbpasswd -a smbuser and it was working just great.

Now I need to add in a different location for public access

Every time I try to access the public share it still prompts for a password from Windows 10 File Explorer. There's an Excel sheet some user is running that needs to drop a file out on this public share and it doesn't support a username or a password.

I read somewhere today in the dozens of pages I found that the authentication challenge happens before the share options are used so I don't even know if this is possible.

I've been reading through the Samba configuration options for smb.conf and nothing is jumping out at me. Wondering if anyone has seen anything like this before?

My config looks like this:

        workgroup = SAMBA
        security = user
        map to guest = Bad User

protocol = SMB2

#========== Share Definitions ============

inherit permissions = yes
inherit owner = yes

[private]
        valid users = smbuser
        path = /files/privateshare
        browseable = yes
        guest ok = no
        writeable = yes
        public = no

[public-share]
        path = /publicdocs/data/share
        browseable = yes
        guest ok = yes
        writeable = yes
        public = yes
        guest only = yes