Hi @Rahul Gollapalli
How did you configure it on your server? I find an article which describes in detail about installing and configuring Workflow Manager in SharePoint 2016 / 2019:
https://spgeeks.devoworx.com/configure-workflow-manager-sharepoint-2016/
You could refer to this article and check whether you have missed some important steps or preparations are not done well step by step. Hope it could help you.
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Best regards,
Yi Lu
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