Hi CZ. I'm Greg, 10 years awarded Windows MVP, here to help you.
See the section here for Custom password recovery steps:
https://support.microsoft.com/en-gb/topic/keep-...
If that doesn't work then let me know and we'll try something else.
Report back results for each step so I know what else to suggest.
Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.
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