@EDFO
I found six models of "Pavilion x360" listed in the compatiblility document:
HP PCs - Touchscreen Compatibility with Pen and Stylus
The supported computer models are in the first column.
If there is a supported Pen for that model, the column is marked with an X.
See the appropriate column at the top of the chart for supported Pen / Stylus
At this writing:

Model name | HP Active Pen (Synaptics) J4R51AA (CAN/ENG, APJ) SPS: 773175-001 | HP Active Stylus (Wacom) T5E12AA (CAN/ENG, APJ) SPS: 834590-001 | HP Pro Tablet Active Pen (Synaptics) K8P73AA SPS: 798051-001 |
| | | |
Pavilion x360 11-k0xx | x | | x |
Pavilion x360 11-k1xx | x | | x |
Pavilion x360 13-s0xx | x | | x |
Pavilion x360 13-s1xx | x | | x |
Pavilion x360 15-bk0xx | x | | x |
Pavilion x360 15-bk1xx | x | | x |
x* - Computers that support the HP Pen can also support the HP Tilt Pen, but the tilt performance might not work on older computers. (Not tested.)
More information...
NOTES
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How-to
Link Contributed by erico -- Video Help – Setting Up Your HP Pen
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