Hi @peter,
Is it within scope for a user to have more than one domain name registered under .dedyn.io?
Hi Bruce,
We currently tolerate more than on domain under .dedyn.io in a user account, but there are indeed some problems (e.g., people creating sub-domains when they really only want a record at a certain subdomain name), and we’re not sure if it’s worth supporting.
So, we encourage people to use only one name unless they have a good reason to do otherwise. It’s possible we’ll enforce this at some point in the future.
Note also that the default domain limit of newly created accounts is 1; registering another name therefore would require to first get in touch with support to get that limit increased.
Stay secure,
Peter
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Thank you @peter! 
I use domain names in testing of Let’s Encrypt ACME Challenges, mostly DNS-01.