When I get an email from GLS Denmark A/S with a tracking URL, the URL looks like this:
http://www.gls-group.eu/276-I-PORTAL-WEB/content/GLS/DK01/DA/5004.htm?txtRefNo=082200853778&txtAction=71000
Deliveries doesn't recognize the URL. But if enter the tracking id (082200853778) manually and select "GLS", tracking works.
I've checked several emails, the only difference in the URL's is the tracking id.