Solved Android app not connecting

[snowman]

Hi everyone, I installed a server on Raspberry Pi 4, verision 18.0.1880. While login from Android APP, shows as follow:
It keep showing "connecting" and cannot make any calls. Firewall test all passed. Any idea what could be the problem? APP version16.7.8.121. Thanks!

 

[snowman]

Fixed, thanks for who has read this post.