Azure Active Directory Application Proxy: Some links are not working

hi All,

I have just configured an AAD Application proxy for our intranet homepage. i can successfully access most of the links on the homepage via the external URL, however,  i am unable to access some links from outside (i.e. via the external URL). are there any rules\considerations of what you can and what you can't access via the external URL in AAD application proxy?

thanks in advance