API key issues (GPT for Sheets)
Your API key is invalid or revoked
Problem: You are trying to set your own API key but GPT for Sheets won't save it.
Solutions
Make sure that you copied it correctly, or create a new one and try again.
Solution for immediate use: If immediate use is needed and using your API key is not a priority, select a model without an API key.
I've entered my API key but it's not working
Problem: You have entered an API key in the GPT for Sheets sidebar but you cannot use it.
Solution
Even though you have entered your own API key, you also need to purchase a pack in GPT for Sheets. Learn more.