I've asked before but didn't get a response so I'll try again. None of my players are able to use any form of consumables. This is very aggravating because they are very helpful when playing raids especially VOG. I'm not sure if there is a glitch or what but I have read all I could find and nobody has been able to help. Hopefully you will actually read this and be able to help me.
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Ok so you are able to have 15 total items in your consumables inventory, you HAVE 15 different items in your consumables inventory. You have to have ONE empty slot or it will not grant you the ammo you are supposed to get. That is a common glitch especially on the older gen consoles. So what I am saying is that you can only have 14 of your 15 slots filled (one completely and utterly emptied) and then you can use your ammo synth. You also cannot use it while coming in from orbit nor can you use them at any point while you are dead or while you are being resurrected. I have noticed the best thing to do is to wait at least 5 seconds after coming back to life before using synths and that should work.