Did you get it working? Walmart site looks like the app has two purposes:
- find the remote if you lost it
- program the infrared patterns to control TVs
And I found a manual for RCTSB3B here: https://www.rcaremotessupport.com/_files/ugd/ec680a_09673ac29cc34e20b0bbace7835548d1.pdf *[it's archived]*
That sounds like a normal bluetooth input device, that part should generally work. Programming the infrared without the app might not work, but it should be fine to use it in combination with the regular TV remote.