All spoilers must be tagged!It should be on HIDIVE as it’s a Sentai license, but recently their content has been disappearing only to reappear weeks-months later. ANN reported on some of them and someone even made a list of the ones that were missing a year ago but I don's see Kids on the Slope listed there so I think it's a recent disappearance.
As for Crunchyroll premium, they’re phasing out free streaming if I recall correctly.