If you see the following message: 

"Entered value is not a valid email address (e.g.: firstname.lastname@pkb.com)"

This means that the format of your email address is not recognised by our system. Please check that you've included the @ sign in your address and you are using a . rather than a , 

These boxes are case sensitive, so smith@test.com and SMITH@test.com would be considered different email addresses by us.