An unhandled fault has occurred in this flow

 ...(like lookup field(s)) in flow throws error: 'An unhandled fault has occurred in this flow' :


An unhandled fault has occurred in this flow

An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information


Reason:

The newly available lookup fields are optional. By default, their Field Level Security sets the fields to hidden, and Flows can't access them.


Resolution

Classic:  Setup > Security Controls > Field Accessibility > Select Object, Field > Change the Access and Save

Lightning :  Setup > Security > Field Accessibility >  Select Object, Field > Change the Access and Save


Resource(s):

https://help.salesforce.com/

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