Hi @Shreyas R S ,
Have you configured the Workflow Manager SSL Certificate correctly? Also make sure you have met all prerequisites for the configuration. And this port isn't blocked in Windows Firewall. The best way is to turn off built-in Windows Firewall in Windows Server.
Please refer to this blog for a simple troubleshooting:
Install and Configure Workflow Manager SharePoint 2016 / 2019 Step by Step
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