OK can you both please do the following:

0) Observe where the end of your current dmesg output is
1) Manually turn on force power 
# echo 1 | sudo tee
/sys/bus/wmi/devices/86CCFD48-205E-4A77-9C48-2021CBEDE341/force_power

2) Check in /sys/bus/thunderbolt/devices/0-0/ and read the NVM version sysfs 
node
3) Turn off force power
# echo 0 | sudo tee
/sys/bus/wmi/devices/86CCFD48-205E-4A77-9C48-2021CBEDE341/force_power
4) Collect all messages after the end of dmesg output notated in 0 (Not just 
thunderbolt ones)

** Changed in: fwupd (Ubuntu)
       Status: New => Triaged

** Changed in: fwupd (Ubuntu)
       Status: Triaged => Incomplete

** Changed in: fwupd (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1768627

Title:
  Update loop for Thunderbolt NVM for Xps notebook 9360. Installed
  version is not recognized (00.00)

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