PHP/Apache OAuth2 Client Credentials Authentication Failure

Question

I'm setting up a PHP OAuth2 server using Client Credentials and I'm using Postman to test. When I run the test I get "Warning: Unable to verify the first certificate". In researching this issue, it appears that it is unable to verify the Godaddy cert. In Apache2 I have both the site cert (which is a wildcard cert) and the Intermediate Godaddy cert. Everything for browsers runs just fine. I also get the same error when I run "openssl s_client -showcerts -connect <devsite.com>:443". From everything I can see the cert is loading and working just fine, so why is it failing for Postman and OpenSSL? Is there something else I am missing? Here is my Apache config.

<IfModule mod_ssl.c>
    <VirtualHost _default_:443>
        ServerName devsite.com
        ServerAdmin webmaster@localhost

        DocumentRoot /var/www/devsite

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        SSLEngine on

        SSLCertificateFile       /path/to/devsite.crt
        SSLCertificateKeyFile    /path/to/devsite.key
        SSLCertificateChainFile  /path/to/godaddy.crt

        <FilesMatch "\.(cgi|shtml|phtml|php)$">
            SSLOptions +StdEnvVars
        </FilesMatch>
        <Directory /usr/lib/cgi-bin>
            SSLOptions +StdEnvVars
        </Directory>
        
        SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1
        SSLHonorCipherOrder on

        SSLCipherSuite "EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH+aRSA+RC4 EECDH EDH+aR>

    </VirtualHost>
</IfModule>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet