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DRV2667: No output signal is generated

Part Number: DRV2667


While making a board with this Piezo driver I encountered a weird issue.
After sending the first example (in the drv2667 documentation)
no difference on OUT+ and OUT- is measurable.

What's strange is, that the boost converter is generating 105V
and 50V is present on both OUT+ and OUT- for about 1ms. But no signal is generated

The measured output on OUT+, OUT- and BST/PVDD looks like this: (compare with Figure 51)

I have attached my Schematic, PCB and programm below.

write_to_drv2667(0x02, 0x00);
write_to_drv2667(0x01, 0x00);
write_to_drv2667(0x03, 0x01);
write_to_drv2667(0x04, 0x00);

write_to_drv2667(0xFF, 0x01);
write_to_drv2667(0x00, 0x05);
write_to_drv2667(0x01, 0x80);
write_to_drv2667(0x02, 0x06);
write_to_drv2667(0x03, 0x00);
write_to_drv2667(0x04, 0x09);
write_to_drv2667(0x05, 0x01);

write_to_drv2667(0x06, 0xFF);
write_to_drv2667(0x07, 0x19);
write_to_drv2667(0x08, 0x05);
write_to_drv2667(0x09, 0x00);

write_to_drv2667(0xFF, 0x00);
write_to_drv2667(0x02, 0x01);

I would be very thankful if this issue could be resolved.