So tunnel fails in IKEv1 phase 1 in packet exchange number 3/4.
Most likely a configuration issue. I would check the configuration on both the peer devices again.
Also in the logs i see the SRX trying to use port 4500 indicating NAT happening
[Oct 15 11:03:00 PIC 1/0/2 KMD1]ike_send_packet: <-------- sending SA = { 61ccdef0 4d2dd809 - 41f56fed 0a018db8}, len = 92, nego = -1, local ip= 185.16.71.132, dst = 34.250.189.60:4500, routing table id = 6
Given that the peer device is on AWS, i assume it uses a private IP address which then gets changed to Elastic IP address provided by AWS before going out to internet.
May be we need to use local iand remote identities to verify the identity of the peer device instead of relying on the IP addresses.