Getting HTTP 500 error but nothing on logs (Tomcat + Apache2 reverse proxy)

So, I've been string to configure a server to deploy a customized version of the Exo community platform. The customized version comes in a Tomcat bundle and I'm using Apache 2.4 as a reverse proxy. The deploy finished successfully, however there is a software registration step demanded by Exo and that when things get weird:

• a redirect from Exo takes me to https://community.exoplatform.com/portal/authorize?client_id=ID&response_type=code&redirect_uri=https://server.name.edu:80/registration/software-register-auth to link my local installation to my Exo tribe account (external, not managed by me)
• When I authorize the installation I get an HTTP 500 error and there is nothing in the logs besides this (I looked into the general Apache log and the Virtual host log as well but there is nothing):

WARN | Failed : HTTP error code : 500 [o.e.p.c.s.r.s.i.SoftwareRegistrationServiceImpl<http-nio-0.0.0.0-8080-exec-13>]

I tried several different configurations but I'm completely stuck. How could I solve this issue? Or at least, there is a way to debug it so I don't end up with this generic HTTP 500 error?

In my server.xml I have added the following configuration:

<Connector address="0.0.0.0" port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
               enableLookups="false" redirectPort="6565" bindOnInit="false"
               connectionTimeout="20000" disableUploadTimeout="true"
               URIEncoding="UTF-8"
               compression="off" compressionMinSize="2048"
               noCompressionUserAgents=".*MSIE 6.*" compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript" />

And my VHost reverse proxy:

    <VirtualHost *:80>
        ServerName server.name.edu
    
        HostnameLookups Off
        UseCanonicalName Off
        ServerSignature Off
    
        ProxyRequests Off
        ProxyPreserveHost On
        ProxyVia On
        <Location />
          Order allow,deny
          Allow from all
        </Location>
    
    
        <Proxy *>
          Order deny,allow
          Allow from all
        </Proxy>
    
        <IfModule proxy_wstunnel_module>
             ProxyPass           /cometd    ws://127.0.0.1:8080/cometd max=100 acquire=5000 retry=5 disablereuse=on flushpackets=on
        </IfModule>
    
        ProxyPass / http://127.0.0.1:8080/
        ProxyPassReverse / http://127.0.0.1:8080/
      
    </VirtualHost>

<IfModule mod_ssl.c>
        <VirtualHost _default_:443>

        ServerName server.name.edu
        ProxyPass / http://127.0.0.1:8080/
        ProxyPassReverse / http://127.0.0.1:8080/
        ProxyRequests Off
        ProxyPreserveHost Off

        SSLEngine on

        SSLCertificateFile      /etc/ssl/certs/cert.pem
        SSLCertificateKeyFile /etc/ssl/private/cert.key

        </VirtualHost>
</IfModule>

(My server ports (80, 8080, 433, etc) are open.)