Hi,
The MPA log should provide more information why OTP mode was not used.
OTP mode should be enabled for sender *and* recipient. If for example
OTP mode is not enabled for the recipient (or sender), the MPA log
should contain a line telling that OTP mode was not enabled (for
recipient and/or sender). Can you check whether the MPA log provides
more information?
it was the OTP setting in the sender profile.
Thanks,
Stefan