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I have a Gmail account linked to numerous Analytics accounts, and a couple of Adwords accounts - that is, I can track stats from a dozen or so sites, and have administration rights for a couple of Adwords campaigns.

However, a client has already set-up their Adwords account and has invited me help administer their campaign. However, when I try to accept, I get the folowing error:

The Google Account xxx already has access to an AdWords account (Customer ID: ). 

As many have discovered, for some reason Google won't let an account that already owns an Adwords campaign, to join another account.

However, I wondering if there is any workaround for this? Temporarily, I'm using a separate Gmail account for this, but what is the longer term solution.

Going forwards, sometimes clients will be happy from me to 'host' their campaigns (but providing them with access), but I'm equally sure that many will want to retain greater control. Surely there must be a better way than creating an additional Gmail account for each client?

How do web/SEO agencies handle this?

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up vote 8 down vote accepted

Use AdWords my client center account. It's designed specifically for agencies to manage multiple clients. Here's the FAQ on MCC accounts, and here's how to create them.

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Ah... I'd stumbled across references to MCC, but never recognised the significance. Thanks. – CJM Jul 10 '12 at 15:41
why do they make it so complex? Google Analytics is plain and simple.. I try the above and there's a warning: "The login yourmail@gmail.com is already an AdWords account" – Yannis Dran Sep 4 '14 at 19:27

You just need to link the account to your MCC. Copy user ID of the account you wanna link to, on the top right corner. Go to my client centre, beside +create account there is grey button called link existing accounts. Open that tab, copy and pastes the user ID, and request for access.

Go back to the account you wanna link to, at the my account-account access to grant the request and you will be done!

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