I submit my email and it says try back later. Why can't I just log into my account and see my purchases, payments and license keys like most other software vendors do?
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No idea why the licence lookup may not be working. (Server maintenance, server fault, other ?) Maybe as it says try again later.
If you have a subscription then see: https://support.piriform.com/hc/en-us/articles/360020674812-How-do-I-manage-my-CCleaner-subscription-#how-do-i-manage-my-ccleaner-subscription--0-0
Bit if the server is down, for whatever reason, then that may not be online either.