Unable to Use 11 Million Complimentary Daily Tokens

I received the message, ‘You’re enrolled for up to 11 million complimentary tokens per day.’
However, I received an error message stating, ‘Error code: 429 - You exceeded your current quota, please check your plan and billing details,’ even though I used only about 5 million tokens.
Additionally, I can see the expected charges for this month.
Why am I unable to use the 11 million complimentary tokens?