My engram inventory is full of umbral engrams
Meaning I cannot collect the one the drifter is giving me, meaning I cant start the forge.
Now I am getting a back up of mission rewards in my post master and other vendors
Allo there,
Bungie are currently investigating this issue. The current work around for now is to use an alternate character. Once you get to the stage of unlocking the decoder, you can get use your main character to decode the ones you have in your inventory and then take the drifters one.
This should be fixed in 2.9.0.1 which is due for release on Monday if you don't want to do the work around above.