Focus on the actual issue: not supporting duct at fan inlet/outlet.
Photograph or mark the condition if someone else needs to approve it.
Ask foreman
In Equipment Connections: RTU, AHU, VAV, Fans & Louvers, I’m looking at: What do I do when not supporting duct at fan inlet/outlet? What should I verify before I cut, drill, seal, cover, move, or install?
Do not
Do not use a flex connector as a hanger, offset, or fix for bad alignment.