If you have converted your blogspot blog to Custom Domain, you are highly advised to save the blogspot URL (address) in case your blog ever get wrongly identified as a spam blog or for TOS (Terms Of Service) violation especially if for some reasons Google/Blogger had chosen to not give you the option of requesting for review by clicking the link to review in the Dashboard. (Do not assume that custom domain blogs are immune to deletion?).
In this case, your only option will be to request for review via the Blogger Help Forum. You cannot give the custom domain URL for review. Only the blogspot URL will help you.
If you do not have your blogspot URL saved somewhere safe and easily retrievable, I would advise you to refer to How to revert custom domain to blogspot if only temporarily, then revert back to custom domain once you have the blogspot URL recorded. Don't take chances if you don't want to run into difficulties when requesting for blog deletion review.