I got the exact same issue; i figure it has something to do with how you export the DDS file there are format options for the DDS; but I have no idea which and I can't find anything online to explain. pretty frustrating.
Edit: So I figured it out. You have to extract as then when you select the dds to save as you get this window and have to pic the compression BC1/DXT1 (this is the only one that worked for me)
Now to the next nightmare; trying to find out how they find the correct names for the resorp dds files. I have no idea how they get it; for example the texture map for CHR_P_EdwardKenway_Legend_DiffuseMap_PC_Durango_Orbis is 20770284.dds; I have absolutely no idea how that was found and I want to find the correct dds name for CHR_P_EdwardKenway_CloakSkull_DiffuseMap_PC_Durango_Orbis but I don't know how.
Edited by mcguireptr, 11 November 2021 - 07:34 AM.