I've created a new service account for some SQL services and it needs to be "Trusted for Delegation". I've copied the SPNs of the original SQL service account. I took all the SPNs I found over there but that did not work properly. I'm not too familiar with how SPNs are working therefore I'm not sure how to setup the account properly so it doesn't break connections in the network. For example, after creating that account, people were not able to use 'Linked Server' in SQL.
Sorry for the long message.