Upsquare IT Support Portal account activation email sometime fails or takes abnormal time to reach @upsquare.in email address.
If you want to raise a support request (ticket), you can follow other available option of email.
To receive activation email from FreshDesk, you can 'try' Forgot Password feature and enter the email ID you registered.
PS - even without registering on portal, you will receive all ticket related communication by email.