Hmm.............. so.............. the infamous ammo glitch and the "double damage" exploit.

I am new at ME games, so I could be missing something, but what if that is considered legitimate tactics?
You can use one ammo consumable and deal more damage than the ones without consumables, but less damage then those that use two. Now, those that use two will run out of them twice as fast as those that use one, meaning they will be playing matches with no ammo consumables, meaning they will deal less damage than players with one ammo consumable. It does make sense to someone who is not well educated in ME universe (me).
But this logic does have a "flaw". One could spend real cash for buying top tier packs, thus getting rares and ultra rares, while spending her/his match credits for buying basic or resource packs thus replenishing the stack of ammo consumables and always playing with two of them.

It would be nice to get an official word on this or patch that prevents that (if it is considered cheating or exploiting).

I am pretty positive they won`t ban people for this.

If BW doesn`t like it, they should fix it ASAP though. I see little reason for this... but I will leave it to them.

Don't lie, the glitch still works perfectly. Its meant to be used with ammo, not other types of boosters.

It works on xbox. I just played a match with it.

I was curious about how big a difference this would make and I could only slot one ammo. I would slot it in one spot and then it would switch to the other. This was some time yesterday. It kept switching to the other slot and leaving the original slot that had it now with nothing equipped which I'm glad for. I am not fond of the idea that people could do this when really they just have to fix the weapons and get their shit together and do some balancing. That said though, I still have to give them props because at least they try to balance things. Coming off a year of ESO (MMO) where balance is pretty much a joke that happens a few times a year and usually makes things worse (like they spitball stuff while high out of their minds and what interests them most sticks), I feel like here they at least earnestly try. Whether or not they get out there and play to see what really feels OP or needs a buff, I cannot say. But having a balance every two weeks that from what I remember in ME3 was not generally a big or small buff/nerf (but my memory might be off) is a vast improvement over ESO style of fucking things up so much a few times a year that you have to redo entire builds or might find some of them and their weapons outright unless in the course of one update.

Why not? What's so bad about warning players against using this? As it stands right now, we do not even have confirmation this is a legit glitch, since Bioware hasn't said anything. This is more like the old Warp-Inferno-Grenade glitch in ME3 than the missile glitch. And also like that glitch, this requires using specific ammo boosters, its not free like the missile glitch. Its not an "Instant win button" like the missile glitch was, either. The missile glitch was truly destructive to the game. This glitch...not so much.

All they have to do is say "Hey, we are aware of an equipment exploit some players are abusing. This exploit is not working as intended, and exploiters will be banned for using it."
The warning should be enough for the vast majority of players. As it stands, there are a lot of players doing this out of curiosity, boredom, or whatever. A warning would put an end to many players using it. There will still be those that abuse it, but players would avoid them more than they do now, again, because of that threat of a ban.

Until they say anything, they cannot ban people for it. And that is simply because they have made no statements about it. Again, I refer to the Warp-Inferno glitch, which never got anybody banned, even though it melted everything it touched. In many ways, the Warp-Inferno glitch was a LOT more powerful than this glitch...given that guns do so little damage. Even the Vanquisher+Glitch cannot compete with high level Inferno Ammo+Warp in ME3MP. Not even close. And that's why this wont get players banned.

If anybody does get banned for this, don't worry I have a great strategy. It involves official bioware social media...

Interesting.
But, on second thought, this could be an advantage for EAware. They simply state this is working as intended as they invisioned certain players will want to do as much damage as possible (as opposed to being a team player) and they planned this "feature" to allow them to spend more ammo consumables. This, of course, means they will have to spend real cash for packs if they want to continue using two ammo boosters, but that's the way this game works.
Crazy, I know. But something slightly similar happened in ESO. Very soon after launch players found out they can cancel animations of combat skills and thus increase their DPS. Zenimax took some time to evaluate the problem and then simply stated they have accepted this as a part of gameplay since it would be too much work to fix it and all players should learn to animation cancel in order to be competitive.

Hottt damnnnn... I just tried it yesterday with  Xain and it was actually fun but hmm...

Very true