Attached figure comes from "PSoC 6 MCU: PSoC 63 with BLE Architecture TRM, Document No. 002-18176"
It is found that the Peripheral Blocks (including TCPWM) can be clocked by clk_peri.
On the other hand, the clock must be provided via one of the peripheral clock dividers.
So, please use "New" clock instead of "Existing" one as follows.
Both configuration can be accepted by PSoC Creator.