Part 107 pilot reported flying in excess of 400 feet AGL without authorization.

Narrative

Hobbyist pilot conducted first company drone operation as a Part 107 pilot. During planning process; management and flight planning sessions was handed off to multiple managers to assist new commercial drone pilot in planning activities. Once on site; the new pilot realized that there was a 400+ foot tower obstruction in the intended flight path (which was not previously identified) and management advised to fly above obstruction since management assumed that the pilot was in uncontrolled airspace (due to the multiple handoffs of the flight planning with the Remote Pilot In Command (RPIC)). RPIC therefore busted the 400 ft. flight altitude in an area with a 400 ft. hard ceiling as set in the UAS Facility Map. The RPIC was also unfamiliar with filing for LAANC prior to the flight and had checked sectional prior which made it appear as if the area was in Class G (since sectionals have less detail and are not as precise as the UAS Facility Map).Overall; the situation could have been avoided if the management team and the pilot had better pre-flight planning communications to include checking airspace together; checking hazards within the flight area together; and assessing the mission parameters prior to the operation. The site was thought of as a simple facility for inspections because it was a small site; and the tower was not seen on aerial imagery. Management should have trained the pilot with a single point of contact; instead of handing off the RPIC to multiple folks to do different phases of the planning process.