Hello Ramesh,
After going through your configuration, I noticed that you have not specified the tunnel protocol under group-policy
group-policy vpn_group_policy internal
group-policy vpn_group_policy attributes
vpn-filter value VPN-ACCESS-IN
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split_tunnel_acl
Correction:
group-policy vpn_group_policy internal
group-policy vpn_group_policy attributes
vpn-tunnel-protocol IPSec
vpn-filter value VPN-ACCESS-IN
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split_tunnel_acl
Hope it will solve your issue.
Kindly rate and mark it correct if you find this solution working.