Some way some how, a user's machine couldn't get read the bitlocker password off of the TPM chip, and I had to enter the recovery key (stored in AD) to get in. No big deal, but once in the machine, I tried to suspend bitlocker per recovery documentation, and got an error message about the TPM not being initialized. I knew the TPM was on and activated in the BIOS, but Windows still made me reinitialize the TPM chip, and in the process it created a new TPM owner password.
I found that odd because it prompted me to save this password or print it (there wasn't an option not to), but it made no reference of a recovery password, nor did it back this password up to AD.
After the user took her laptop and left I started thinking that if the TPM password change, does the recovery password change also? If so, that new recovery password will need to be uploaded to AD, but MS' documentation doesn't make that clear, and doesn't back up the new recovery key (if one exists) to AD automatically when the group policy says it must, and from a network standpoint AD is accessible.