I am having the same issue. Just sends me back to the link page and says:
"Action needed: click here to link your Twitch Prime account to your Call of Duty account"
I have clicked there and went through the process 10-20 times. Still have not gotten my loot.
Same with me. If i get this unexpected error one more time I'm gonna flip *****
I was having the same problem. I pushed the forgot password on my cod account then when I reset the password I unlinked the twitch account then 're did it all and it worked.
I know this is late, but this still shows that this is a problem. I dont want to miss out on bo4 loot