Hello, I purchased the splitter. I plugged it into the back of the Tv, then plugged in the optical cable that is coming from the receiver into one side and the Tv Connector in the other side.
That sounds correct. If you purchased the device that MDB provided a link for above, do all the connections appear secure and tight? I expect that particular splitter is a passive one (no electrical power to run a detector/amplifier and LED) and those split the optical signal so each is weaker and if the alignment of the connectors isn’t right, the signal may drop too much. Active splitters convert the light signal from the source (TV in your case) to an electrical signal, amplify it, and then drive 2 (or more for larger devices or switches) LEDs or laser diodes, one for each output. The active devices are typically more expensive and may be built with better connectors to provide secure and reliable connections. They also don’t actually split the signal so there isn’t loss of light but they require a bit of electrical power to run the electronics.
You might ensure that the short cable from the splitter is plugged securely into the TV - good connectors will “snap” into place and be secure and not wiggle very much. Same for the connectors on the two optical cables running from the splitter to the receiver and the TV connector - they should “snap” into the receptacles on the splitter. Be careful bending the cables - they are typically a single plastic “fiber” and they can easily fracture if bent too much. Plastic fibers also absorb some of the light - for long runs (over 5 meters) the fibers should be glass or higher-quality multi-strand plastic but those are also delicate but perform better optically and are more expensive.
My Oticon TV Adapter 3 has an optical out port - I plug the optical fiber running to a Sonos sound bar into the optical out port so I don’t need to use a splitter. My TV Adapter optical in port connects to the single optical output from the TV. You might check to see if your TV connect has an optical output port - if so you would not need a splitter.