в _Инструкции

cookieDomain : auto или Субдоменное отслеживание

Проблема:

However, if the visitor first visits test.simoahava.com, and then moves to www.simoahava.com, these two domains will have different _ga cookies, and thus different Client IDs, and thus the user will be a different user with a new session!

Вот пример:

https://screenpresso.com/=DSBic

https://screenpresso.com/=eTsOf

Решение:

 

Почему это исправит ситуацию:

The answer is in the cookieDomain setting. When you set cookieDomain to auto, the following will happen with a (fictional) domain like www.simoahava.co.uk:

GA tries to write the cookie on .co.uk, which is the first possible root domain candidate. This fails because the browser is not authorized to write a cookie on a top-level domain like that.
Next, GA tries to write the cookie on .simoahava.co.uk, which is the next possible root domain candidate. This works because that’s a valid domain to write the cookie on.

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