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/lightning/o/Request__c/new?&recordTypeId=0100C000000Sjk1&
defaultFieldValues=Request_Name__c={!Request__c.Request_Name__c},
Account_owner__c={!Request__c.AccountId}
Above piece of code is written on custom button for url in lightning hack and when i click on that button in lighning request name is showing in custom_clone Button but account name is not showing in lookup field.
As I see you have a custom object Request__c. The AccountId is not the correct API name for the Account field.
It has to have __c at the end. I presume that your field API name is AccountId__c
/lightning/o/Request__c/new?&recordTypeId=0100C000000Sjk1&
defaultFieldValues=Request_Name__c={!Request__c.Request_Name__c},
Account_owner__c={!Request__c.AccountId__c}
Just put the correct API name here and make sure the User have an access to that field.
Account_owner__cthe lookup to account?