First verify in the camera settings that RTSP is enabled (with new firmwares RTSP can be disabled by default)

Usually the Reolink cameras expose the following streams, e.g.:

main stream: rtsp://user:password@192.168.5.32/h264Preview_01_main
sub stream: rtsp://user:password@192.168.5.32/h264Preview_01_sub

But some Reolink cameras (e.g. 4K) expose the following main and secondary streams instead, e.g.:

main stream: rtsp://user:password@192.168.5.32/
sub stream: rtsp://user:password@192.168.5.32/h264Preview_01_sub

Note: to connect by ONVIF, verify also that ONVIF is enabled in the camera settings.
The default ONVIF port is 8000, e.g.:
onvif://user:password@192.168.5.32:8000