[Google Maps API v2] How do I create more than 10 API keys?

We are creating sites for our clients/partners - each has their own
domains. I have created 10 API keys, and now getting error while
creating the 11the API key:

"An error has occurred. Please retry later."

From what I understand there is no limit on how many API keys we can
create.

How do I create more API keys?

Thanks,

.. Bhavan

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