I am experiencing the exact same issue Stuart is seeing with a Dell XPS 9350, while the same set of QC35's connect just fine to my desktop and iPhone. So it clearly seems like an issue with the Dell hardware/driver.\
It "pairs" fine in Windows but never connects.
Hi @hossy13 ,
You are not alone with this problem, as quick google search will return. The issue is to do with Windows and how it pairs with the headphones through Bluetooth. This is not limited to Dell laptops only or the wireless/bluetooth card as the issue is seen across different models from multiple manufacturers.
My recommendation is to try a combination of the following two links and the steps I have outlined above.
Then try this if that fails - https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware/windows-10-bose-quietcomfort-3...
Ultimately, this issue lies with Windows and Bose.
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