Same here; J'ai pu get the écran de verrouillage to show HH:MM via my personal account with admin privileges, no hidden admin account needed. This is how:
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Appuyez sur Win+R, type intl.cpl and appuyez sur Entrée (cela va open "Region" settings)
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Set your "Short Time" & "Long Time" formats in the window that comes up, puis cliquez sur "Apply."
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Select the "Administrative" tab en haut, then cliquez sur le "Copy settings..." button.
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In the subsequent window, vérifiez le box for "Welcome screen and system accounts."
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Cliquez sur le "OK" button and lock the PC with Win+L to test it.
