Magic items
is not DM Fiat. This is expected and this most of them will be acquired through reknown.
Adventurers League Player’s Guide v.10.06APPENDIX 2:
RENOWN
All characters accrue renown based on their level/tier.RENOWN TITLES BY TIERTierTitle1Novice2Adept3Veteran4HeroicRENOWN
BENEFITS
Your character starts a new adventure or chapter, they gain inspiration and one renown benefit associated with their current rank or lower. Renown benefits can’t be sold and are lost at the end of the adventure or hardcover chapter, whichever happens first.
RENOWN BENEFITS BY TITLE
Rank Benefit
Novice: Potion of healing
Adept: Potion of greater healing, a silvered weapon, or 10 pieces of silvered ammunition
Veteran: Potion of superior healing,an adamantine weapon, or 10 pieces of adamantine ammunition
Hero: Potion of supreme healing or a spell scroll valued at 2,500 gp or less (see Buying Potions and Scrolls)
RENOWN MAGIC ITEMS
At Adept and higher rank, your character gain access to basic magic items—specifically bags of holding, +1 weapons, +1 shields, +1 rods of the pact keeper, and +1 wands of the war mage—and can choose as many of them as their Magic Item Limit permits. While they can’t be sold or traded, they can replace and be replaced by other items between sessions.These items are thematically linked to your background. For example, a Folk Hero might be given an old +1 longsword and a +1 shield from a retired adventurer back home, while a Sage may find a +1 wand of the war mage hidden in a library and use an old, dusty bag of holding on their adventures.
And the magic item tier limit is
Tier 1 = 1
Tier 2= 3
Tier 3= 6
Tier 4 = 10.
So either you find your magic items or your patrons/organisation will provide you some. These items are supposed to be given to you or the DM is putting them in addition to what you can find. It is highly unfortunate that this is not written anywhere but in the adventurer's league.
Here is the full link:
https://media.wizards.com/2020/dnd/downloads/AL_PGv10_0.pdf
Edit: And notes that this is for RotM. And this document is the usual stuff for each adventure that has been released so far. The items you find are in addition to what a faction will give you or make available to you. Sometimes, 5ed feels a bit like 1ed. You need to look everywhere to find the relevant information that you need.