Joshua B. + Citadel Sanctuary? (Close/merge me when you get a chance)

The title pretty much says it all.

I believed that I could use Joshua B. at the beginning of a turn, take another click. Then, at the end of the turn, choose to activate Joshua’s end-of-turn first, get a tag, then activate Citadel to remove said tag. A friend says this can’t be done. I countered that the stack doesn’t exist in Netrunner, and it’s not like both abilities go on the stack at the same time.

Do we have a rules expert or official ruling on this?

This has been asked (and answered) before in the Official Rules Question Thread, see the answer here (the question is one post above).

No you cant do this. You could use josh B plus Aaron marron however to get tag free 5 click turns, given enough counters