SSH Debug Logs?

Hey all. Are there any SSH Debug logs to find out more about what SSH clients are doing during login/auth requests?

My issue is that I am using Termius, which is a cross-platform SSH/SFTP client. On my Ubuntu desktop, it works fine to connect to my Unraid boxes (two of them both show this issue). On their iOS app, Unraid throws bad password errors and SSH fails. 

I've of course triple-checked my root password is correct, but for whatever reason Unraid isn't having it.

Unraid boxes are running 6.6.1 & 6.6.2, both exhibit this behavior.

Good (Ubuntu Termius client):

Oct 14 13:25:52 NAS02 sshd[19889]: SSH: Server;Ltype: Version;Remote: 10.1.1.100-35774;Protocol: 2.0;Client: libssh2_1.8.1_DEV
Oct 14 13:25:52 NAS02 sshd[19889]: SSH: Server;Ltype: Kex;Remote: 10.1.1.100-35774;Enc: aes128-ctr;MAC: hmac-sha2-256;Comp: none [preauth]
Oct 14 13:25:53 NAS02 sshd[19889]: SSH: Server;Ltype: Authname;Remote: 10.1.1.100-35774;Name: root [preauth]
Oct 14 13:25:53 NAS02 sshd[19889]: Accepted none for root from 10.1.1.100 port 35774 ssh2
Oct 14 13:25:53 NAS02 sshd[19889]: SSH: Server;Ltype: Kex;Remote: 10.1.1.100-35774;Enc: aes128-ctr;MAC: hmac-sha2-256;Comp: none

Bad (iOS Termius client):

Oct 14 13:27:00 NAS02 sshd[20558]: SSH: Server;Ltype: Version;Remote: 10.1.255.3-55983;Protocol: 2.0;Client: libssh2_1.8.1_DEV
Oct 14 13:27:00 NAS02 sshd[20558]: SSH: Server;Ltype: Kex;Remote: 10.1.255.3-55983;Enc: aes128-ctr;MAC: hmac-sha2-256;Comp: none [preauth]
Oct 14 13:27:01 NAS02 sshd[20558]: SSH: Server;Ltype: Authname;Remote: 10.1.255.3-55983;Name: root [preauth]
Oct 14 13:27:01 NAS02 sshd[20558]: Failed password for root from 10.1.255.3 port 55983 ssh2
Oct 14 13:27:01 NAS02 sshd[20558]: Received disconnect from 10.1.255.3 port 55983:11: Normal Shutdown [preauth]
Oct 14 13:27:01 NAS02 sshd[20558]: Disconnected from authenticating user root 10.1.255.3 port 55983 [preauth]

Clients are both in my LAN. This occurs on both of my Unraid boxes. I have a support request open with Termius to find out how their two clients differ, but thought I could dig into the SSH server side of things in Unraid while I wait.

Thoughts on how I can dig further?