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Running that command does update my Pulumi.dev.yaml file to prefix all variables with "api:" however the program running in github actions still gives that error.

I've tried all sorts of combinations, different access tokens (personal and team), using the GH action to just install the pulumi cli and doing all the commands directly, nothing seems to work.

Finally got to the bottom of it:
I had named my stack file `pulumi.dev.yaml` initially, this seemed to work fine locally but at some point I changed the casing to capital "P" `Pulumi.dev.yaml` and git didn't detect the change. GitHub actions then couldn't find the stack file when the file was lowercase. :face_palm:

Now changing to the correct casing its working....