[SalesForce] Delegated approver not able to approve

How about trying :

• If the need is only for everyone to see all data, then View All should suffice. Get rid of the Modify All (except for maybe a full System Admin)

• Granting View All and Modify All on a per object basis rather than blanket (on a need basis, or only View All to everyone but Modify All only to those Profiles that really need that permission)

• Create a Public Group containing all the roles and create a sharing rule per object to share all data as Public Read Only with everyone in the group. This way they can see all data but only modify what is rightfully theirs to edit. (Or as @eyescream says Sharing Rule to share everything owned by the top role and internal subordinates with top role and internal subordinates as Public Read Only)

Unanimous Checkbox refers to each person or group within the approval process. Although the queue is made of many queue members, the queue counts as one approver, so whoever from the queue approves the record, is approving it on behalf of the entire queue. So as the way the approval process is set up, this is unanimous approval. In order to accomplish what you are trying to do each individual person would have to be named in the approval process. Then unanimous approval would require each individual person to approve before the pparoval goes through.

This is similar to using a queue as a record owner, although there can be multiple members of the queue, the queue still only counts as one entity, not a group made up by its members.

I hope that makes sense and helps.