@Ahmed Essam
Your SQL is clustered, so you may need to check which certificate is being used follow the steps.
You may refer to the last reply of the thread:
https://social.technet.microsoft.com/Forums/en-US/a96b7ba6-32cc-4ceb-a1e0-b0952d5a134d/sccm-2012-db-migration-certificate-chain-error?forum=configmanagermigration
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