i had the otap service on my software.
on the new release of iot toolbox (5.1.4), the device is not display in the otap menu. When i use a sniffer. I see the the device in advertissing with the uuid of the otap service.
When i try with an older relaser of iot toolbox ( 5.0.9), i see the device.
How the iot toolboox filter device for otap?
Hope you are doing well. I couldn't replicate your issue.
Did you modify something to the example? I would recommend to test it with the latest SDK version and with the example without modifications.