Shopify Flow how to get the order additional details to use into liquid?

Shopify Plus
4 
{{ order.customAttributes['key'] }}

I’ve given this a go and the flow seems to accept this however, when changing the actual key name to a given attribute, it rejects it. For example:

{{ order.customAttributes['DeliveryDate'] }}

This is rejected by Shopify Flow, throwing an error message claiming that the reference does not exist.

Currently, I am using Arrigato Automation as a solution which does work well however, I thought that Shopify Flow would offer this functionality. Might be a bug but if anyone has any other suggestions, happy to take a look.

Thanks,

Ryan

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