Can non HK residents enter HK flying from Taiwan?

Can non HK residents enter HK flying from Taiwan?

Unless there is some restriction now because of Covid-19 you can. I’m not sure if there are any added restrictions now. Your agent should know.

Depends on where you have been in the prior 14 days.

Only in Taiwan is it okay? and is quarantine required?

You should be asking the Airline that you plan to fly on.

If its Cathay, this is what they say https://www.cathaypacific.com/cx/en_TW/covid-19/hong-kong-travel-restrictions.html

I would imagine that others are similar.

EDIT - Non-HK Residents are not permitted. Everyone who is permitted entry must do Hotel Quarantine for 14 days, Staying in an AirBnB etc is NOT permitted.

This and check with your home country’s embassy/economic office.