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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If your consumables slots are all full I have heard of that causing issues. Make sure you have an open slot and then try using one.