When I want to use shadowlands boost token I get disconnect and error WOW51900319.
But when I log in character, I can play normally. What can I do?
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I have the same problem like you ? Do you also play on a Mac with M1 ??
Yes, I am. Do you think it is connected?
Iam not sure, at the moment I can not login 
I just opened a ticket. I see that there are more people with the same issue, but can’t see connection to M1 chip. We should wait I think.
Hi .i have same problem i play only classic…in pc…
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Just found this on forums:
Guys, I found a solution for MacBooks with M1! Worked to do a character boost without getting disconnected.
Find World of Warcraft Application in Finder. Right Click, “More info”. Make sure you choose both “Open in low resolution” and “Open with Rosetta” for World of Warcraft.
This worked perfectly for me!