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prefix also needs to use `pulumi.interpolate`

yeah, I found that, but I also realised that `appServicePlanName` a bit higher up also uses `appName` which is apparently not supported.
The resource name can't use `pulumi.interpolate`

yes, resource names must be known ahead of time so the stack can be built

hmm, so best to not make them depend on anything environment specific then

which makes sense, this should all be hidden behind stacks