For Malaysians below 40 yo (based on friends and family's ETA applications), generally you will need to give yourself more time to get an ETA.

I've been applying every year for the past 3-4 years, every year also ask for more info, every year also I'll apply around 2 months in advance lol. My most recent application was in March this year, submitted extra info on 3rd March, got the approval letter on 8th March. Hopefully you'll get a respond within this week.