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Thank you for sharing the detailed explanation of your approach. Currently, sharing a self-hosted integration runtime (SHIR) across different Azure services like Azure Synapse and Azure Data Factory is not directly supported. The SHIR can only be shared within Azure Data Factory instances and not across different Azure services such as Azure Synapse Analytics and Azure Data Factory within the same Microsoft Entra tenant.
There is no supported workaround to share an SHIR between Synapse Analytics and Azure Data Factory.
For more details, please refer: Data integration in Azure Synapse Analytics versus Azure Data Factory
If you need to use the same on-premises infrastructure, you can install multiple SHIR instances on the same on-premises machine (server/VM) and configure them separately for both Synapse and ADF. This will allow both services to interact with your on-premises resources without conflict.
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