Following this guide, Create Grafana Cloud API keys | Grafana Cloud documentation I don’t have an option to create an API key under Administration. Could this be because I am on a trial?
Are you sure that you are checking Grafana Cloud administration and not Grafana administration (please note Grafana Cloud != Grafana)? What’s the URL in your browser?

That’s correct. API keys are deprecated, so Grafana Cloud doesn’t offer them anymore. Use Access Policies