On https://climb-europe.com I don't have Denmark listed in the country dropdown at checkout NOR in the list of allowed countries in the backend
In the directory_country table Denmark is listed as country_id DK, iso2 DK and ISO 3 DNK It is also listed in en.xml - Denmark
The locale for the store is UK so en_gb and it has multi stores
Anyone have any ideas as to how to get Denmark showing up in the list of countries?
Can you please share your Magento version ?
I have Magento 2.4 and Magento 2.3.5 installed and I can see Denmark in both checkout and admin.
if it doesn't show in checkout frontend, you can enable it from admin :
Store > Configuration > General > General > Country Options > Allowed Country
have you changed anything ?
can you just disable your custom modules and check ?
I was sceptical about your suggestion, but it looks like one of the extensions - Worldpay from Sellxed is removing Denmark.
I disabled it on our staging instance at http://climb2.essentiallogic.net/ and I now have Denmark in my drop down list
I've contacted Sellxed and will see what they say