Well open.rocket.chat is now monitored by me now! So you can ask there in #support
if I create a channel the notifications do not arrive as for normal messages
I do not understand this?
Do you mean it is different between channels. Or is it is different between direct messages and channels?
Please explain the steps that you take. Just do simple steps.
Also, have you got an account at cloud.rocket.chat? Have you checked your push notification usage?