Hey @Hanni Lim5
(1) Sorry for the inconvenience! It doesn't have anything to do with you being on the free plan. I'm checking with our team on that; however, in the meantime, feel free to grab the personalization code from a broadcast/sequence and paste it over into the incentive email — the code is the same :) Also, just a friendly reminder that the personalization code will only work in the body of the incentive email, not the subject line.
(2) You can set up a custom email template for this! We have a guide on our visual email template editor here11 :)