You may not have given permission for Facebook to share your email address with LeagueRepublic and Facebook have provided the following possible reasons for this... 

1/ Permission not given for the LR app to receive email address (within FB --> settings --> apps --> LeagueRepublic)

2/ No Email address on account

3/ No confirmed email address on account

4/ No verified email address on account

5/ User entered a security checkpoint which required them to reconfirm their email address and they have not yet done so

6/ Users email address is unreachable

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