"In business there is no "maybe"."
Translation:У бізнесі немає "можливо".
It's accepted and was at the moment you wrote this comment. If it wasn't for you, maybe there was some other typo or mistake. It's usually announced in a red pop-up message. In general, please always post your exact input so that I can tell you why it wasn't accepted, I have no way of figuring it out now.
"мабуть" is accepted.
I don't know how you decided that your answer wasn't accepted precisely because of "мабуть" and not any other possible mistake you made.
If your answer wasn't accepted, it happened for some other reason. I cannot tell you for what reason because you didn't provide your answer here. Please always provide your full answer in the comment if you have a question about why it wasn't accepted.