Symptoms
If brand has suffix specified on Settings > Brands > example.tld screen, "Guides" link on top frame of provider's interface will lead to non-existing location. 404 error will be shown.
Cause
This issue was passed to OA Engineering team as POA-107195.
Resolution
Workaround for the issue is to edit the file /usr/loca/pem/etc/branding/branding_htaccess.tmpl on OA management node by adding a line:
RewriteRule ^servlet/Help(.*)$ ${path_prefix}/servlet/Help$1
Then re-sync the brand via pressing Edit and then Submit on corresponding screen. New rule will be propagated to brand setting on web-server.