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An external ID is a custom field that has the “External ID” attribute, meaning that it contains unique record identifiers from a system outside of Salesforce.

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Apex triggers can't reference external objects or call out to external data sources

Accessing External Objects in a trigger requires a callout. Callouts are not permitted in triggers. You will need to move your code to be asynchronous, using the Queueable interface, for example. Ther …
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