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when trying to set up sync, my email address is shown to be an "invalid email address": what address should I use?

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when i try to set up a new sync account, the first thing is to enter my email address. When i type in the first few characters in my email address, a red star and "invalid email address" appears below the line for entering the email address. Why? What is wrong with my email address?

when i try to set up a new sync account, the first thing is to enter my email address. When i type in the first few characters in my email address, a red star and "invalid email address" appears below the line for entering the email address. Why? What is wrong with my email address?

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Just ignore that message and keep typing your email address there.