Do you live in Singapore on long term visa there? Not much been posted about Singapore as Singapore citizens cannot apply there. Only foreigners with long term visa or PR.
I think there are 3 options. 1. Your are employed by an employer with an employent contract. 2 You own a company and you write a letter as owner saying you can work remotely. I know a couple of people who have done this. 3 You are a freelancer working for multiple clients. You show your portfolio of this work ie Website, online academy Upwork portfolio etc
Yes, it depends on the office. Chonburi did not bother with it but implemented October 2023 again for overseas trips. I went to UK and reregistered. Went to Vietnam a couple of. Months later and went to the office but told to go away. Too much work lol