So as Adventist we hold that Christ ascended to the heavenly sanctuary...

Hebrews 8:1,2 We have such an high priest, who is set on the right hand of the throne of the Majesty in the heavens; A minister of the sanctuary, and of the true tabernacle, which the Lord pitched, and not man.”

Which is in heaven and began his work...

Hebrews 9:12 Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us

There in the Sanctuary in heaven, the true tabernacle which the Lord set up and not man. Christ ministers on our behalf, making available to believers the benefits of His atoning sacrifice offered once for all on the cross.