Hi,
Do you use an Exchange account?
Based on my test, ADAL related password seems to be always saved in Credential Manager. I've researched a lot and currently haven't found any official articles to turn off this feature.
Besides, as you already have 2FA enabled, it is much more secure for your account. You can directly use 2FA verification to log into your account.
If you have any concerns, please feel free to post back.
Regards,
Aidan Wang
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