Not able to use roaming

I am in Hong Kong for several days and I expect roaming is available as I checked the coverage map. However, i cannot connect to any providers here and it keeps having No service.

I tried restarting, resetting network and ask telus expert. I also checked with them the roaming partner and tried to connect manually but no luck. 

Any idea what I can try?

Telus expert is so so so helpful and offer me technical support by calling back my number. As I told you I have NO SERVICE overseas, how you are able to call back to solve my problem? The support from telus is totally unprofessional and ridiculous.