Rstudio Server (open source) authentication using PAM

I installed Rstudio Server (open source) on CentOS 8 and everything is working perfectly, except I am not able to log in using a non-linux user. My company is basically windows-only. They gave me a linux server so I could run Rstudio server, but they aren't going to help me configure it for PAM. I admit I know very little about PAM.

'roger' is my linux username and 'bosr' is my windows username. I am able to log in fine with my linux username, but when I try to use my windows username, I get the error message Error: Incorrect or invalid username/password

I installed the pamtester and I was surprised to see that the pamtester shows successful authentication using my non-linux (windows) username:

[ ~]$ sudo pamtester --verbose rstudio bosr authenticate
[sudo] password for 
pamtester: invoking pam_start(rstudio, bosr, ...)
pamtester: performing operation - authenticate
pamtester: successfully authenticated

I was hoping that pamtester would show me where the problem was, but given that pamtester was scucessful, what should I try next?

My /etc/pam.d/rstudio currently looks like this:

auth      requisite uid >= 500 quiet
auth      include        password-auth
account   include        password-auth

I have tried,, None of them work. Also, is there any log file where I can see more about what the problem may be? Thanks in advance.

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