This is the exact situation we are currently experiencing. I have a team that cannot reverse JEs without a password, so it's all on me to enter the password and reverse. The QBO support team has given me similar responses: "Just enter the password," "Talk to your accountant," "Just open the period of the original JE," or  "Just enter the password." Each time I explain that the reversal pertains to an open period, they don't seem to understand what that means. Instead, they insist that "you can't revise a JE that relates to a closed period."

Surprisingly, some members on my team have been able to reverse one JE per day without entering a password. We joke about having a limit of 1 JE reversal per day, but it's not funny. This seems like a glitch because there's no apparent reason why it would work for 1 JE but not for others.