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I'm trying to prepopulate the lookup field in child objects from the related list of parent.
But it seems the URL hack is not working for that. Event when I hardcode the value, it's still not working
/lightning/o/CustomObjectA/new?recordTypeId=0126g000000Ogh8&
defaultFieldValues=
00N6g00000UQ7Fa_lkid={!CustomObjectB.AccountId__c}
I had same issue. On several tries this worked
/lightning/o/Product2/new?recordTypeId=....&defaultFieldValues=ParentProduct__c={!Product2.Id}
00N6g00000UQ7Fa_lkid