The ‘remote’ is Bluetooth paired to the TV - no sign of infrared Tx on the ‘remote’ and no mention of infrared in the user manual. So it appears you are out of luck with that ‘remote’ as far as I can see. If you have any other ‘remote’, preferably one that’s linked to a device connected to the TV, then you could try that instead. Or contact Toshiba support to see if there’s a way around the issue.
If no joy, then there are mini-remote devices like this that will likely solve the issue…
https://www.amazon.com/Remote-Control-Compatible-Playbase-Playbar/dp/B0C8W2PM25