URLForUbiquityContainerIdentifier returns nil even if configured correctly

Question

I am having the problem, that URLForUbiquityContainerIdentifier is returning nil in some cases even if the user has set up everything correctly in the settings. My code:

Answer 1

Check that you have enabled iCloud containers in your entitlement. The containers are not added by default when you enable entitlements. Click the "+" sign in Target/Summary/Entitlements to add your appId.