Activation emails are usually pretty fast, but can sometimes take up to 15 minutes to arrive. Please also check your spam / junk mail folder - and if the email has ended up there, make sure to mark it "Not Spam" to help future messages get through.
The email will come from eif+notifications@em.teamdetails.com - it may help to add this address to your contacts / trusted senders.
If you've recently requested an email, please wait at least 20 minutes before trying again.