YouTube channel is the destination for the good standing videos and the monetization policy is also very clear. It is also announced the monetization suspension policy for the users. It is implementing the policy of flagging the videos of the channel for monetization reviews to resolve several issues on your channel.
The monetization acceptation will depend upon the good standing of the particular channel. So, one must follow the guidelines for the monetization of the videos on YouTube platform. If your channel is not up to the mark to undergo monetization, then YouTube will inform you before 40 days before suspension of monetization.
Is monetization was disabled on your channel?
There will be several reasons behind the disabling of the monetization on your YouTube account. There may be having some copyright strikes, content ID related issues, ineligible videos and other violations of the policies under Adsense, etc. may lead to the disabling the YouTube account for monetization.
But, after 6 months they can again review your channel, if the issues were clear they will enable your monetization.
Sometimes there will not be any notification or Email towards your disabling of monetization because
Account can only suspend by the YouTube administration only, and no one can else do it. So, there may be some suspended channel in your mainstream account in the history that was saved on the YouTube servers.
So, they will not notify you about it as the system thought that is all about the previous history of your mainstream and looks after six months period. So, one must need to wait until the period of review. If your channel had good standing after six months means YouTube will get again enable your monetisation.