How can I transfer a cloud mailbox from user A to user B
Solution 1:
You were told correctly. It can't be done.
Here are four ways you can accomplish what you need:
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Disable the user account for UserA. Grant UserB Full Access to the mailbox for UserA.
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Convert the mailbox for UserA to a Shared mailbox. Grant UserB Full Access to the mailbox for UserA.
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Export the contents of the mailbox of UserA to a PST file. Import the PST file into the mailbox of UserB.
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Export the contents of the mailbox of UserA to a PST file. Attach the PST file to the email client of UserB.