I am having the same issue. I get the message: Could not mount “New Volume”. (com.apple.DiskManagement.disenter error -119930878.). It initially worked but when I moved some files from my machine to make room for Monterey update, I am getting this message. So many important files are in this drive and I haven't seen anything that could be of help anywhere else. Let me know if you get it to work and I will if I do on my end. \
Good luck!.
clemencefromgermantown
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