at the moment the Approval Delegation UI in Service Portal only allows 1 person to be added.
It must be possible to define multiple persons as delegates.
this is possible already today via REST call on table 'TaskDelegationConf'. if multiple delegates for the same person are added via REST call, only the last one will be shown in the approval delegation UI. however the approval works for all entered delegates. so basically the functionality is already there, the UI just needs to be enhanced for the same.
furthermore it would be great if delegates can be configured for dfferent kind of approvals. e.g. if I am the manager for a person and at the same time owner of a device, I need the possibility to delegate this to different people.