What Should I Do if My Email is Already in Use?
That email already has a Gleam account. Log out and sign in with it instead.
When entering a contest you are able to change the email address you are entering with by clicking Edit next to your login details.

If you attempt to change the email address you are entering with you may get an error that the email address is already in use.

This means you have previously created or entered a Gleam campaign using the email address you want to change to. Since that account already exists in Gleam, you cannot update the email address on your current account to one that is already in use elsewhere.
Instead, you will need to Logout of your current account, and sign in again with the email address you want to use.
Then click Edit to unlink any social account you don't want on that account.
If you lost access to a linked social network account, you can recover your Gleam contestant account through email verification.
Log in with any social account you've connected to Gleam before. Lost access to it? Choose Email and we'll send you a recovery code.
Log in with a social account you've connected to Gleam before, linked to the same email. Can't? Choose Email and use Send Recovery Code instead.
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How Do I Know if a Campaign is Available in My Location?
The Competitions widget will automatically show you all the entry methods available if you are within the allowed region.