Clearing T420 TPM via WMI won't work

Hello together,
right now I'm facing a problem with Thinkpad T420 using the TPM for BitLocker-Encryption after Win 7 installation:
When having installed Win7 before so that the TPM is already owned, it is not possible to clear the TPM via the TPM WMI.
Clearing the TPM using the BIOS control panel works just fine.
But as we can't give the users the BIOS password and have no chance to retrieve the TPM's owner password we are trying to clear the TPM by setting a physical presence request.
Setting this request seems to work, as during the next reboot the confirmation screen is showing up, asking to confirm clearing by pressing F9.
But then the actual thing - clearing - just won't happen.
I've already tried using
a) the single step requests "clear" followed by "activate" after reboot and
b) the combined one "clear, enable and activate" .
But only the enable/activate part realy happens.
Usualy I would expect the TPM status to change like this:
a)
Enabled          True                               True                                   True
Activated          True    ->clear->          False      ->activate->      True
Owned            True                               False                                  False
b)
Enabled          True                                              ​            True
Activated         True      ->clear, enable, activet->        True
Owned            True                                              ​            False
Instead "owned" will just keep being true.
On T410 and T500 both a) and b) work exactly as expected.
I tried using BIOS versions 1.41 and 1.43.
Anybody having tipps what to do about this? Or this a "works-as-designed" issue, although I can't realy imagine that...?
Alex

There is a work-around for this issue.  If you leave the system powered off for 30 seconds after executing the physical presense request, then when you turn the system on you will see the F9 prompt and the TPM will be cleared as expected.  The key step is to leave the system powered off for 30 seconds.
I will still request a BIOS fix for this issue, but usually such fixes are slow to release.  I hope this work-around can help you for the short-term.

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