Just to be 'obvious' - you did use the mission unique power regulator given to you, not another one you had in your inventory, right? Make sure to look for the one with typically blue text and an icon when equipping it, if you happened to bop in and out of your SRV to take care of scavengers first or something...I can't finish any restoration mission. When I do insert power regulator into the housing and boot the reactor, it won't simply register objective completition.
I tried missions in different systems, all with the same result.
any Solution on this?
It happens if you do it too fast.
Did you try powering down then back up again?
That works for me when it happens.
Make sure the tick box is visible in the top right corner.