First, check your email's spam folder. From time to time, some spam filters will categorize these types of activation emails as spam. If you cannot find it, it's possible that your IT department has established some company-wide spam filters which other employees aren't even aware about. Please contact them and ask if such filters are in place, and to add emails from Tradeshift to their safe list if that is the case. 

If you still cannot find the email, please contact our support