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Abhishek Thakur 17Abhishek Thakur 17 

Regarding Lead conversion

Hi

Recently we have migrated to new salesforce system. In the new system When converting a lead, the system didn't identify the existing account by default; I had to look for it.

In the old system, it will identify by default how to achieve this in new system.
SwethaSwetha (Salesforce Developers) 

Hi Abhishek,
By new system, do you mean a new instance? Can you setup debug logs in old and new systems and compare the logs to see if there is any custom code like trigger

Related: https://salesforce.stackexchange.com/questions/323438/how-to-identify-between-new-or-existing-account-record-in-trigger-when-a-lead-is

Thanks