You exceeded your current quota, please check your plan and billing details

It happens due to of your tier in Open AI, please increase your tier in OpenAI and the model will appear for your account.

Official message from OpenAI

On July 6, 2023, we gave access to the GPT-4 API (8k) to all API users who have made a successful payment of $1 or more. We plan to open up access to all developers soon, and then start raising rate-limits after that depending on compute availability. For API accounts created after August 18, 2023, you can get instant access to GPT-4 after purchasing $0.50 worth or more of pre-paid credits. You can read about prepaid billing.

So you need to fill in your OpenAI account or try to use our other plans with our OpenAI API Key with the highest Tier and highest rate limit for enterprise apps from OpenAI.

Plans: Professional, Business

Here the link: GPT, Claude, Mistral, Gemini for Sheets