Installed 1.18 on my XPS 9560 and I still have the same problem no TPM detected.
But as my laptop is just over a year old Dell refuse to help me in any way whatsoever, this is appalling customer service!
I've got a 9370, and I see that Dell has just released BIOS ver. 1.12.1. The description says it addresses two items related to the TPM. The BIOS also addresses some security issues identified by Intel, but after reading this thread I'm reluctant to upgrade. Everything is working fine now.
the issue still takes place on my XPS 9560. I have upgraded BIOS v.1.18.0
When the device is starting I see the message TMP device not found.
unfortunately, only 1.15.0 and earlier don't have the issue. you can downgrade to that to get rid of the alert.
i've been interacting with dell who said they were 'escalating' the case, but nothing happened, and now they tell me to talk to the warranty department.
Yes the problem was resolved by Dell replacing my motherboard on my 9560 XPS. I now have the most current BIOS, no errors when booting and the TPM feature is visible, which was hidden before replacement.