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buttonless_dfu 15.1 not advertising for s112

I have SD and BL secure flashed to the device, and now trying to get the second part of buttonless_dfu + app with settings flashed next.
After flashing the second part, DfuTarg no longer advertises, or any advertising.
The app works fine on its own based on the ble_template, then combined the app with buttonless_dfu as the base, which also seems to be based on the template, and that combination compiles fine.
(I have the buttonless tutorial working start to finish, but tutorial does not have a combined example).

RTT does not seem to display any info after this flash, and now not sure of where to look for clues.
Checking section placements in SES, the standalone app has the same flash & ram settings as the template, but not the buttonless_dfu template which has slightly different values.

15.1_template_custom_app
FLASH_PH_START=0x0
FLASH_PH_SIZE=0x30000
RAM_PH_START=0x20000000
RAM_PH_SIZE=0x6000
FLASH_START=0x19000
FLASH_SIZE=0x17000
RAM_START=0x20001b48
RAM_SIZE=0x44b8

15.1_buttonless_custom_app
FLASH_PH_START=0x0
FLASH_PH_SIZE=0x30000
RAM_PH_START=0x20000000
RAM_PH_SIZE=0x6000
FLASH_START=0x19000
FLASH_SIZE=0xf000
RAM_START=0x20001c18
RAM_SIZE=0x43e8

Changed the combined buttonless_custom_app settings to template_custom_app but same results of no advertising. Maybe other section placements settings would work.

Any other way to debug and find the error for buttonless_dfu not advertising?

thank-you,

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