Hi @turtleo4 
Welcome 
to the community!
You’re not alone in dealing with this issue.
Other members have also mentioned HERE that some custom GPTs have gone missing with messages like “GPT inaccessible or not found.”
It seems like Code Copilot GPT has disappeared too.
We’re not sure if this is due to a policy or terms issue, or if it was removed by mistake. It’s likely that GPT Builders are reaching out to OpenAI to resolve it.
For now, you might just need to wait a bit.