There are no known restrictions on Sender ID to Denmark.
As of Nov 1, 2018, messages that contain URL in the content may be filtered out and blocked by certain operators.
You may also notice that our SMS numbers for Denmark are not the standard long virtual number format. They are in fact short codes, although the name would suggest otherwise, this means they are longer than the standard numbers associated with Denmark.
This does not affect delivery and will not have any knock on effects for the end user.