Windows rdp always failed - remote-desktop

PC A:
In home ethernet
Windows10 2004 x64 pro
PC B:
In office ethernet
Windows10 1909 x64 pro
If I use android microsoft rdp, I can connect PC A from office network.
But if I use PC B, I get a black screen, then report the rdp session is over: error in connection establishment or network.
Thank those who can think about any suggestions.
The memory occupation of PC A is about 40%
Restart PC A or PC B seems no use

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