How can sacraments confer grace without apostolic succession?
How can Communion be practiced as Christ instituted it without apostolic succession?
It seems to me you are saying that all anyone would have to do is follow a formula and voila! Real Presence. I don’t think that’s what you believe, so I hope you will expound!

Otherwise, I am left to guess.
For some answer to that question, one must look to Luke 9:49-50
In this section, we see reference to a man who was casting out demons in Jesus’s name. The Apostles tried to stop that man because he wasn’t one of them — i.e., didn’t have Apostolic Succession. What did Jesus say? To
not stop him! Because whoever is not against you is for you.
Granted, this person wasn’t confecting the eucharist — but he still, nonetheless,
was doing something that the Apostles thought Jesus had only authorized
them to do. And this verse may be seen as rather thin for being the whole basis of Holy Orders outside of Apostolic Succession - and one is very right in saying that one shouldn’t take something in scripture and interpret it however you want. However – there is more.
Let’s take the most extreme case. Let’s suppose there is a boat full of people who grew up in a church which has a priest validly ordained with Apostolic Succession. (I know there are people here of different denominations — so as to the question of “Which denomination are they from?”, for the sake of argument, I’ll say “It’s from one of the denominations who’s Holy Orders you see as valid”).
Now, this boat crashes, and there are only five survivors — and among the survivors not a single bishop, not a single priest, not even a single deacon. These five survivors wash up on a remote island and there is no hope of them ever being rescued.
Is one to suppose that God is so faithless as to withhold sacraments from these five people just because they can’t ever recovery Apostolic Succession? Considering all God has done, I’d say He deserves more credit than that!
You may say they can be faithful Catholics - just no sacraments. Then what if one of them at one point commits a mortal sin, and ten minutes later sincerely repents of it ---- but (since the island is priestless) he is unable to go to confession for the rest of his ten remaining years. Does that mean he’s going to hell for that? You may say that in this instance, I’m being overly-mechanistic in my view of God’s grace. Then why does the condemnation of such mechanistic view start here, covering this person’s mortal sins, yet not apply to such an extremely strict interpretation of Apostolic Succession? (And if you say that this guy
is going to hell for that mortal sin that he never is able to confess — then, once again, you are accusing God of being faithless.)
Granted, again, I’m talking about confession, not about the eucharist. However, if one believes (as I do) that the eucharist really is the body and blood of Jesus (which I believe) do you
really think that just saying a Communion Prayer for the last so many years of your life is a substitute for Jesus’s very real body and blood?
In short ---- many good arguments can be made for the strong
desirability of Apostolic Succession (and I agree that it is
very preferable for the minister who confects the eucharist to have Apostolic Succession) ----- but, in my opinion, and the opinions of many others as well, to say that it is 100% completely necessary (or even that it must totally trump any other issue with regard to where one should go to receive communion) is to de-value God’s love, God’s grace, God’s mercy — and above all, God’s faithfulness.
I know there is a trend in this tread to expect people to say what denomination they are from — and I will now do so to the best of my ability — though I am difficult to categorize.
I consider myself to be Independent Catholic — though many in the Independent Catholic movement would disown me due to precisely my belief regarding Apostolic Succession ---- there are many also who would
not disown me over that belief.
I consider myself Catholic, not Protestant (though obviously Independent Catholic rather than Roman Catholic) ----- there are differences between Protestants and Catholics other than the big question of Apostolic Succession.
Though I know I am not the only one who identifies as Catholic that shares my belief on Apostolic Succession, I am the only one I know of who practices that belief ---- though I am sure there are others out there. For where I go to Church – I visit various Churches to stay in touch with other Christians. I receive communion at home. I know it is real — and I know so by the same gift of discernment that showed me that it is real in Roman Catholic parishes. This gift of discernment, as a matter of fact, is a major part of what led me to come to faith in Christ in the first place!!!