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Had a typo in my lambda permission:

```# Give cloudwatch permission to trigger
lambda_.Permission(
    "exportDashboardEventTrigger",
    action="lambda:InvokeFunction",
    function=exportDashboardLambda.name,
    principal="<http://events.amazonaws.com|events.amazonaws.com>",
    source_arn=cloudWatchEventRule.arn
)```
Works, and:

```# Give cloudwatch permission to trigger
lambda_.Permission(
    "exportDashboardEventTrigger",
    action="lambda:InvokeFunction",
    function=exportDashboardLambda.name,
    principal="<http://events.amazonaws.com|events.amazonaws.com>",
    source_arn=cloudWatchEventRule.arn.apply(lambda arn: f"{arn}:*")
)```
Does not work