Per this link https://apps.juniper.net/hct/product/?prd=SRX4200 is supported.
SRX-SFP-1GE-TPart Number: 740-013111Small Form Factor Pluggable 1000Base-T Gigabit Ethernet Module
Caveat:The SRX4200 Services Gateway supports only 1000 Mbps speed on SRX-SFP-1GE-T; 10-Mbps and 100-Mbps speeds are not supported.
Introduced Release(s):
Junos OS 15.1X49-D65
*SRX4200
*740-013111 SFP-T
The interface is created as xe-0/0/4
Physical interface: xe-0/0/4, Enabled, Physical link is Down
This is expected , the interface its going to work as 1g even when named "xe"
Example:
Physical interface: xe-0/0/4, Enabled, Physical link is Up
Interface index: 146, SNMP ifIndex: 516, Generation: 149
Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Link-mode: Full-duplex, Speed: 1Gbps
Add the necessary configuration to xe-0/0/4