Adding NextCloud Account doesn't sync contacts

Problem

After adding a NextCloud account via Online Accounts, the NextCloud contacts do not appear in Contacts, nor does its address book appear in the list of address books.

Expected Behavior

Adding a NextCloud account with contact syncing enabled should cause NextCloud contacts to appear in Contacts.

Steps to Reproduce

• Add a local contact to Contacts
• Go to Online Accounts and add a NextCloud account with contact syncing enabled
• Return to Contacts application, notice no new contacts appear
• Check Change Address Book... option, confirm only Local Address Book appears

Additional Notes

I attempted to reboot the system in case there was some background syncing task that needed to be triggered or reset after adding NextCloud, still no change.