Setting Turn server on EC2 - amazon-ec2

Question

I am using EC2(Amazon Linux 2). I created Turn server
0: log file opened: /var/log/turn_8708_2020-07-08.log
0:
RFC 3489/5389/5766/5780/6062/6156 STUN/TURN Server
Version Coturn-4.5.0.3 'dan Eider'
0:
Max number of open files/sockets allowed for this process: 300000
0:
Due to the open files/sockets limitation,
max supported number of TURN Sessions possible is: 150000 (approximately)
0:
==== Show him the instruments, Practical Frost: ====
0: TLS supported
0: DTLS supported
0: DTLS 1.2 supported
0: TURN/STUN ALPN supported
0: Third-party authorization (oAuth) supported
0: GCM (AEAD) supported
0: OpenSSL compile-time version: OpenSSL 1.0.2k-fips 26 Jan 2017
0:
0: SQLite is not supported
0: Redis is not supported
0: PostgreSQL is not supported
0: MySQL is not supported
0: MongoDB is not supported
0:
0: Default Net Engine version: 3 (UDP thread per CPU core)
=====================================================
0: Config file found: /usr/local/etc/turnserver.conf
0: log file opened: /var/log/turnserver_2020-07-08.log
0: Config file found: /usr/local/etc/turnserver.conf
0: Domain name:
0: Default realm: meetmocha.com
0:
CONFIGURATION ALERT: you specified long-term user accounts, (-u option)
but you did not specify the long-term credentials option
(-a or --lt-cred-mech option).
I am turning --lt-cred-mech ON for you, but double-check your configuration.
0: WARNING: cannot find certificate file: turn_server_cert.pem (1)
0: WARNING: cannot start TLS and DTLS listeners because certificate file is not set properly
0: WARNING: cannot find private key file: turn_server_pkey.pem (1)
0: WARNING: cannot start TLS and DTLS listeners because private key file is not set properly
0: NO EXPLICIT LISTENER ADDRESS(ES) ARE CONFIGURED
0: ===========Discovering listener addresses: =========
0: Listener address to use: 127.0.0.1
0: Listener address to use: 172.26.193.9
0: Listener address to use: ::1
0: =====================================================
0: Total: 1 'real' addresses discovered
0: =====================================================
0: NO EXPLICIT RELAY ADDRESS(ES) ARE CONFIGURED
0: ===========Discovering relay addresses: =============
0: Relay address to use: 172.26.193.9
0: Relay address to use: ::1
0: =====================================================
0: Total: 2 relay addresses discovered
0: =====================================================
0: pid file created: /var/run/turnserver.pid
0: IO method (main listener thread): epoll (with changelist)
0: WARNING: I cannot support STUN CHANGE_REQUEST functionality because only one IP address is provided
0: Wait for relay ports initialization...
0: relay 172.26.193.9 initialization...
0: relay 172.26.193.9 initialization done
0: relay ::1 initialization...
0: relay ::1 initialization done
0: Relay ports initialization done
0: IO method (general relay thread): epoll (with changelist)
0: turn server id=1 created
0: IPv4. SCTP listener opened on : 127.0.0.1:3478
0: IPv4. TCP listener opened on : 127.0.0.1:3478
0: IPv4. TCP listener opened on : 172.26.193.9:3478
0: IPv6. SCTP listener opened on : ::1:3478
0: IPv6. TCP listener opened on : ::1:3478
0: IO method (general relay thread): epoll (with changelist)
0: turn server id=0 created
0: IPv4. TCP listener opened on : 127.0.0.1:3478
0: IPv4. TCP listener opened on : 172.26.193.9:3478
0: IPv6. TCP listener opened on : ::1:3478
0: IPv4. UDP listener opened on: 127.0.0.1:3478
0: IPv4. UDP listener opened on: 172.26.193.9:3478
0: IPv6. UDP listener opened on: ::1:3478
0: Total General servers: 2
0: IO method (admin thread): epoll (with changelist)
0: IPv4. CLI listener opened on : 127.0.0.1:5766
0: IO method (auth thread): epoll (with changelist)
0: IO method (auth thread): epoll (with changelist)
I have tested My turn server on Trickle ICE page:
But When I am calling Turn server from my Javascript code still not able to make screen sharing connection on different network while if I make connection on same network than successfully made.
For example, I share my laptop screen to my mobile both device connected with same wifi than work perfectly but if internet connection different than not working so I set up Turn server on my EC2 server. After adding Turn server to my Javascript code I am not able to share screen on different network.
Please can anyone help me regarding this?