That's the episode
Counterpoint and it is on my list below

I wonder what went wrong? There's 69 results and a few of them are only mentions of the Transporter Room, but most are valid.
Occam's Razor? I think I just blew the search.
So 69 out of 172. 40% to start. That's much higher than I thought but let's break it down.
Maneuvers - significant TR scenes. I forgot all about this one.
Counterpoint - significant TR scenes. There are about 4-5 VOY eps I have never seen, and this is one of them.
Phage - huge TR scene. I should have remembered this as it's a good ep.
Prototype - two TR scenes.
Relativity - opening scene only and in the past.
Investigations - no real scenes.
Drone - one TR scene, but significant.
Resistance - no scenes.
Death Wish - opening scene only. I should have remembered this.
Caretaker - brief scenes; not surprised I forgot them.
Tattoo - two scenes. Not my favorite ep (but not as bad as people say).
Tuvix - this one I actually remembered.
Prophecy - short TR action. One of those eps I've never seen.
The Void - three short scenes.
Demon - yes! Significant plot points. I should have remembered this. The most significant use of the TR so far.
Jetrel - two short scenes, but significant.
Emanations - significant TR action. So early (Seska good!) I forgot about it.
Dreadnought - three short scenes.
Imperfection - opening scene only.
Faces - two short scenes.
Gravity - one tiny scene and one significant scene.
Warlord - significant TR action. I should have remembered this.
Dark Frontier - not actually the TR, but the holodeck and not particularly significant.
Eye of the Needle - significant TR action up there with Demon.
One Small Step - no scenes.
Future's End - one tiny scene.
Non Sequitur - no scenes.
Juggernaut - no scenes.
Mortal Coil - three small but on balance fairly significant scenes.
Macrocosm - three tiny scenes.
Threshold - no scenes.
Darkling - I've never seen this one. Very significant TR action.
Ashes to Ashes - one scene lasting a few seconds.
False Profits - oof. I purged this one. One significant TR scene and two smaller ones.
Unforgettable - two tiny scenes.
State of Flux - no scenes.
Fair Trade - no scenes.
Alliances - one scene. Forgot all about it.
Once Upon a Time - one tiny scene.
Learning Curve - oh, right. One scene but significant and funny.
Worst Case Scenario - one scene, hologram flashback. Not surprised I forgot it.
Equinox - no scenes.
Someone to Watch Over Me - two scenes. Incidental but I remember them now.
The Omega Directive - no scenes.
Collective - no scenes.
Thirty Days - one scene. I remember it now.
Hope and Fear - no scenes.
Twisted - no scenes.
Hunters - no scenes.
The Raven - no scenes.
Shattered - no scenes.
Blink of an Eye - two significant scenes, one with key dialogue. I should have remembered this.
Flesh and Blood - one tiny scene.
Warhead - one scene lasting about 5-10 seconds.
Time and Again - no scenes.
Endgame - one scene with two lines lasting 5 seconds.
Basics - no scenes.
The Chute - no scenes.
Day of Honor - no scenes.
Child's Play - one scene, four lines.
Prime Factors - one scene, early ep, but significant.
Unimatrix Zero - a glimpse with no dialogue.
Blood Fever - just one scene, but funny. I remembered it right away.
The Haunting of Deck Twelve - no scenes.
Bliss - one tiny scene.
Nemesis - one tiny scene.
Night - big, dialogue-heavy scene. My bad for not remembering this.
The Swarm - no scenes.
Innocence - one short scene. I've never seen this ep.
And finally, add in The Disease where you see Harry and Tom coming out of it, but no dialogue takes place in the TR.
So in the end, I can forgive myself - mostly - for not remembering much about Voyager's transporter room. 22 of the 69 episodes only mention the TR without showing it, so it only appears in 47 of 172 episodes (27.3%, not counting The Disease). Of those, there are only 17 where I would characterize the appearance of the TR as significant to the dialogue or the plot, so we're down to just under 10% of 172 episodes. 155 Voyager episodes do not show the transporter room at all or only show it in highly brief, incidental scenes.
By contrast, I can remember without thinking hard about 40 Star Trek episodes that involve important dialogue or plot points taking place in the transporter room. In fact, I just went through the episode list of Star Trek, and it's far easier to identify episodes without transporter room scenes than those with such scenes. I think the introduction of the holodeck as a story driver, Voyager's general lack of "enter standard orbit"-type episodes, and the lack of any recurring character who was identified with the transporter (outside of maybe Seska) all contributed to a pretty unmemorable TR on Voyager.
And now I need to rewatch Voyager, something I've long intended!