Comment # 8 on bug 1228863 from Richard Brown

(In reply to Martin Abele from comment #7)
> Is it a chicken - egg problem? With ask-pin option the pin is not valid
> because the TPM was wiped and without the option, the system insists to
> provide the recovery pin...
> 
> What command is used to enroll the TPM during the installation or during
> firstboot respectively?

I think it’s more likely your claim that you’re resetting or clearing your TPM
is false/incorrect, or incomplete 

If you compare the logs from comments #4 and #6 you see evidence of different
event log entries which should be impossible if the system is booting the same
OS each time with a clear TPM

Are you sure you’re clearing the TPM each time, and not booting into any other
OS? (Dell maintenance/recovery tools would count as a different OS)