Unable to connect a server through java code by using jsch - after redhat 8 (FIS) implemented

Expectation is Need to connect aws server through java code by using Private Key
I was able to log in successfully until Redhat 8 implemented in the server end. If I disable the FIS (Fuse Integration Service) then working as expected. I have tried with many ways, no luck. please help to resolve this issue Let me know if need more info
Using intellij for java code

Private key format is RSA 3 and i have converted into RSA 2 by using PuttyGen
Key pattern is________________________________________

    PuTTY-User-Key-File-2: ssh-rsa
    Encryption:none
    Comment: rsa-key-20220125
    Public-Lines:12
    AAAn23vnonBIhk......................
    ..........................................................
    ...........................................................
    Private-Lines:28
    AACABdkfjal905slknf................
    .............................................................
    Private-MAC: nbfajesrkkjnajfnga;alksdnfal;dks
    
    Java code is
   <pre lang="Java">JSch jsch = new JSch();
   jsch.addIdentity(privatekey)
   Session session = jsch.getSession(username, hostname, port);
   session.setConfig ("StrickHostKeyChecking","no")
   session.connect();

I am always getting below error
    com.jcraft.jsch.JSchException : Auth Fail
    at com.jcraft.jsch.Session.connect(Session.java:519)
    at com.jcraft.jsch.Session.connect(Session.java:183)
    

Log from server end#
by using linux command "systemctl status sshd.service
________________________________________
    rexec line 29: Deprecated option KeyRegenerationInterval
    rexec line 30: Deprecated option ServerKeyBits
    rexec line 66: Deprecated option RSAAuthentication
    rexec line 82: Deprecated option RhostsRSAAuthentication
    reprocess config line 66 : Deprecated option RSAAuthentication
    reprocess config line 82 : Deprecated option RhostsRSAAuthentication
    error: Receivved disconnect from <ipaddress> port <id>:3 com.jcrat.jsch.JSchException:Auth fail [preauth]
    Disconnected from authenticating user ec2-user <ipaddress> port <id> [preauth]
    ________________________________________
Please find below train -f messages when i try to logged in through Putty 0.76 successfully Service Tail message when i try to log in through PuTTY successfully
    Reached Target Timers
    Reached target Paths
    Listening on D-Bus User Message Bus Socket
    Reached target Sockets
    Reached target Basic System
    Reached target default
    Startup finished in 324ms
    Started User Manager for UID 1000