Hi @benny.wong ,
Welcome to Microsoft Q&A forum and thanks for reaching out here.
After migration, you will need to make sure that the Self-hosted Integration Runtime is installed properly in Azure VM and the SHIR in ADF is pointing to the new IP address of your Azure VM. If it still reflecting to the old IP address, then you can delete that old SHIR and create a new SHIR with same name as the old one so that you don't have to update the linked services where it is being used/referenced.
In case if your data sources like Azure SQL are firewall enabled then you will have to whitelist the new Azure VM IP address in order to allow successful connection from ADF.
Ref doc: Create and configure a self-hosted integration runtime
Hope this helps.
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