Sorry for not getting back to this thread. But we resolved this issue. There was a plugin that was very obscurely named that managed this process. In there, there was a line to append the "bio" page with the proper content from the intranet link. Basically:
if("bio" == trim(htmlspecialchars(urldecode($tmp[0])),ENT_QUOTES)){ // attorney page for CRM needs only
...
$q->where (array(
...
'TV.value' => strtoupper(trim(htmlspecialchars(urldecode($_GET['id'])),ENT_QUOTES))
...
));
When removing the ",ENT_QUOTES" from that line, everything worked fine.
The ENT_QUOTES function seems to have been looking for a quote character to modify, but it was confusing the value for a quote (which contained a number 3) with what was being entered from the username. We think that this was modifying the Employee ID value to remove the 3 from the string, which wasn’t matching up with a biography and was sending to a 404 page.
Very strange
