I contacted an email address a dealership gave me. I was having the same problems. Their answer was as follows:
1) Log in through
https://aftersales.daimler.com/ and select the 4 bars icon at the top-right of the page.
2) Select Settings.
3) Click on the blue link that reads, “
Dealer-Who-Is-Who” under “Language setting”.
4) On the next page, Select “Modify my data”.
5) Select “Preferred language” (choose your native language here)
6) Click on “Save modificatios”
7) Log out and log back in.
After I did the above things still didn't work. They then told me to log in through Internet explorer instead of Google Chrome or Mozilla Firefox. After logging in through internet explorer it worked fine. However, I'm extremely agitated that I have to run two separate search engines to make things work. In addition, the Xentry portal is extremely slow and clunky. It freezes up often, and after only 10-15 minutes of inactivity it kicks you out. It irks me to no end that just when they have a system that works perfectly they decide to introduce a new one that is only half as good. Go figure.