I finally figured it out guys (No thanks to EA's awful support).
The Offer files you need should be located in (D:\SteamLibrary\steamapps\common\Dragon Age Ultimate Edition\Offers" NOT THE ONE IN THE DOCUMENTS FOLDER
You will need to copy those over to two places. C:\Users\Dante\OneDrive\Documents\BioWare\Dragon Age\AddIns as well as C:\Users\Dante\OneDrive\Documents\BioWare\Dragon Age\Offers
The manifest.xml files may not copy over to the C:\Users\Dante\OneDrive\Documents\BioWare\Dragon Age\AddIns\dao_prc_ocp_1, so make sure to copy and place those into the correct folders.
After this it gets a bit more complicated. You need to open the Addins.xml files located C:\Users\Dante\OneDrive\Documents\BioWare\Dragon Age\Settings
Then you will need to find the lines for each DLC. For me, it was Return to Ostagar, and The Stone Prisoner.
Locate the following lines: <AddInItem UID="DAO_PRC_CP_1" Name="PRC_CP1_Cailan" for Return to Ostagar, and <AddInItem UID="DAO_PRC_OCP_2" Name="PRC_CP2_Shale" for The Stone Prisoner.
You will add the letter O before CP_1" Name="PRC_CP1_Cailan" for Return to Ostagar. Like So <AddInItem UID="DAO_PRC_OCP_1" Name="PRC_CP1_Cailan"
(Feel free to copy and paste the latter line instead)
For The Stone Prisoner, it is the same. Add the letter O
<AddInItem UID="DAO_PRC_OCP_2" Name="PRC_CP2_Shale" is what the line should read.
Hope this helps!