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I have a flow that is registered and is using github storage with this configuration
```access_token_secret=os.getenv("PREFECT__CONTEXT__SECRETS__GITHUB_ACCESS_TOKEN")```
I’m trying to test with a PAT I generated today, setting `GITHUB_ACCESS_TOKEN` in the Context part of the UI when I run the flow

So you should store the secret on Prefect cloud, and then in the `access_token_secret` , provide the Secret name.
```access_token_secret="GITHUB_ACCESS_TOKEN"```
Prefect will then fetch it on the execution side for you

If I’d like to avoid adding a `GITHUB_ACCESS_TOKEN` to the secrets, say I add a `GITHUB_ACCESS_TOKEN_BRIANSORAHAN` with my PAT, how do I use this in a run I start via the UI?

You would need to add that in the flow so it knows what secret to use to pull it down and register. The alternative is putting that env variable on the agent and using a local secret if you don’t want it stored on prefect cloud