Thanks everyone. I've sorted it out. I didn't pay attention at the time. A letter was sent with a new Securityholder Reference Number on the 18th Mar 2020. Luckily I found that letter and entered it into my holdings in Automic using "Add holding". When I logged out and back in again, there it was as an issuer sponsored holding.
AB1 Price at posting:
18.0¢ Sentiment: Hold Disclosure: Held
