Hi,
Ospf network type is not matching at both ends. SRX side it is point-to-point and Microtik side it is broadcast. Change it to point-to-point at Microtik side. Remove authentication for troubleshooting purpose and add it later once the neighborship is up. Share the results if OSPF is not coming up
run show ospf interface Interface State Area DR ID BDR ID Nbrs gr-0/0/0.0 PtToPt 1.1.1.1 0.0.0.0 0.0.0.0 1
/routing ospf interface add authentication=md5 authentication-key=juniper interface=gre-tunnel1 \ network-type=broadcast