Dear, Is it required to use a full body safety harness while working on scissor lift platform. The manufacture saying it is not required. Please give me your feedback...

FranK I think you were unintentionally brushing off the OP. You surely meant "No, they are not required" Bob

The correct answer would be: It is not normally necessary for personnel working from a Vertical lift to wear fall protection equipment, other than in exceptional circumstances. The need for a fall protection system will be the outcome of a job specific risk assessment undertaken prior to work commencing and taking into consideration the manufacturer’s operators’ manual.