Hello Akash. I would check the IQService port first. Unsupported or unrecognized SSL message usually means IIQ is sending TLS to a non-TLS IQService port.
Run IQService.exe -v and confirm a Configured TLS Port is shown. For an existing instance, configure it if needed:
IQService.exe -o <TLS-port>
Restart IQService, use that same port in the AD application with Use TLS for IQService checked, and register the client-auth user:
IQService.exe -a "Domain\User"
Also enter that IQService User and its password in the AD application. Client authentication is mandatory with TLS, and those fields are required once Use TLS for IQService is enabled. See Securing the Communication Path to IQService.
If the TLS port is already correct, I would next check the IQService certificate, the IIQ JVM trust configuration, and the IQService version. See IQService Troubleshooting and IQService Commands.
First Check whether you have imported the IQService Certificate in all the application servers of SailPoint. Then also import the IQService Certificate in Personal>certificates folder of the IQService Server. Also configure the IQService in TLS port. “IQService.exe -o ”.