echo won’t change channels when i say history, espn , hallmark ect; but if i say 12,4,165 167 it works. how do i fix it?

echo won’t change channels when i say history channel or hallmarkor espn. but if i give it a number chanel like 4,6 12 ,165 it works

if i say alexa go to channel 12 its goes… if i say a word like go to history channel it won’t