ROG Phone 2 doesn't work with ROG XG17 monitor

[88945561]

I got my XG17 few days ago, from the manual it says
USB Type-C port • Used to connect to a valid source such as Notebook/PC/Mobile phone that supports USB Type C DP Alt Mode; signal input supports maximum to resolution 1920 x 1080 @240Hz.
I tried to connect my phone to XG17 with type c to type c cable, but no signal. It seems like ROG Phone 2 doesn't supports that Type C DP Alt Mode?
Also, I tried to use type c to hdmi adapter to connect the micro hdmi cable (which they provided in XG 17 box) to my ROG phone 2, failed too.
I've tried to turn my screen to 60Hz on my phone, still no signal on XG17. I've also tried to connect my monitor to my iPad pro with the same adapter I bought, it works well.
So is there some setting I missed?

[Anders_ASUS]

You need to connect via the phones sideport

[88945561]

Anders_ASUS

You need to connect via the phones sideport

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Thanks for reply Anders. I tried the sideport but didn't works. I also tried to connect XG17 via usbc to hdmi adapter with hdmi to micro hdmi cable, and this combo works with any other devices such as Razer blade pro, Xperia 1, Pixel slate, Samsung S10+, and iPad Pro but ROG Phone2. I'm sooo confused why only ROG Phone2 can't work. I even tried to reset it to factory setting but still failed. I really don't know whats going on here...

[Titan_ASUS]

@88945561
Same thread of yours handled by Panda_ASUS....
https://zentalk.asus.com/zh/discussion/25931

[88945561]

Titan_ASUS

@88945561

Same thread of yours handled by Panda_ASUS....

https://zentalk.asus.com/zh/discussion/25931

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That's me lol. Just posted in both Chinese and English to get more helps.