Big Sur password problem

I have installed Big Sur on an external disk, the internal disk is in Catalina.
My profile is admin.
When I open a session my password works fine, but when I want to modify something in the system preferences it does not accept my password.
Just to ascertain that I did not mix up something I erased the disk, and reinstalled Big Sur. No avail.

Any help would be most appreciated.

MacBook Air 2020
16 GO
i7
Up vote post of larsfromsoucieuenjarrest Down vote post of larsfromsoucieuenjarrest
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larsfromsoucieuenjarrest
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I have the exact same situation. I have Big Sur installed on an external drive, Catalina on internal drive. Big Sur boots fine and my password at login works fin, but I can't unlock padlock in System Preferences.
Posted by
Dazzzz
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I had the same problem with a Big Sur installation on an external disk. Resetting the SMC resolved the issue for me:

https://support.apple.com/en-au/HT201295
Posted by
mattprowse
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FWIW I got it to work without incident after I re-created a new VMware instance with 10.15 and then upgraded to 11.0. I had the same problem described here, where it wouldn't let me login, when I had previously tried updating from a well-used Mac VM.
Posted by
jalkut
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Thanks @mattprowse that worked! 👌🏻
Posted by
victorfernandez
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Having same experience on my Mac mini. Wiped system and it still happened. Going to try SMC reset and will update everyone.
Posted by
jakewalker
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I had the same problem too - and also couldn't register TouchID fingerprints. Resetting the SMC fixed it - thank-you @mattprowse.
Posted by
mkflint
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Same problem with Big Sur Beta 5 - my user account lost access to admin privileges, with no apparent way to get them back.

Resetting SMC didn't work, though, as my Mac doesn't have TouchID (MacBook 2016).

Puzzled what to do next.
Posted by
lookmark
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I use a password vault. It is STICKY PASSWORDs.

Since I upgrade my OS to BIG SUR, it will not let it ope/be visible.

How do I fix this?
Posted by
Rugman2
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