julian I will be very thankful for your help in this question
I can see email field in my cookie with the exact email as in the manage/users and also there is a green mark nearby email.

Also, how matching exactly works? For example, if I pass(to a cookie) as a value to the key field an id of the user in the nodebb, will it match it? Or do i need to pass to the cookie the exact email as well? Thanks

eugene_thedev you'll want to use the email validation methods in src/user/email.js to check whether a user's email is validated.

You can also do this programmatically by calling setUserField to set the email, and then user.email.confirmByUid

julian, thanks for you answer, also could answer my last question?

Also, how matching exactly works? For example, if I pass(to a cookie) as a value to the key field an id of the user in the nodebb, will it match it? Or do i need to pass to the cookie the exact email as well? Thanks

eugene_thedev session sharing plugin will look for id first, and check it against the stored hash for it.

Otherwise it will fall back to email.

julian so if i pass to id field an id of the user from nodebb and there is no remoteIds to this user, they will be matched?