iscalik - Make sure the Orchid user you are authenticating with is not the 'Live Viewer' role. This would prevent that user from viewing playback streams.
You can try increasing the logging verbosity of Orchid and seeing if there is any useful logs when you try to access the RTSP endpoint. Do this by modifying the
/etc/opt/orchid_server.properties file so that the following line is set
severity.file.default = debug
The logs are found in