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It sounds like there might be an issue with your account...it sounds like Crave isn't attached to your profile correctly. You should be able to watch channels 400, 401 (HBO) and 406-409 (Crave Movies) as well as access the Crave On Demand menu (On Demand --> Channels --> Crave).
You may need an agent to fix this - I'd recommend using the chat feature (looks like a happy face in the bottom right corner of telus.com/tvsupport).
Channel 404 is an Optik-specific channel that accesses Crave On Demand.
I use my X-box as my streaming device, so my answer might be limited to that. But I have found that during times of peak demand (such as when the House of the Dragon premiered), the Crave Account server gets overwhlemed. Sometimes logging in again (which is a bit tedious, but do-able) works, but every rare occasion, I have to wait for the surge to die down. Try logging yourself in during non-peak hours and see if that solves it.