Can not add my library to my Samsung Galaxy phone

Hello ! Android user here and I have a problem with adding my library to my phone. I've tried everything but I seems my phone can't display my dekstop library to YACreader Android. I don't seem to have any firewall in my phone. A Samsung Galaxy A12 by the way. Don't know what to do.

Where do you have YACReaderLibrary running? What happens when you scan the QR code?

It's running on my desktop when I scan the QR code it saves the IP address and the port but when I save the library and open it loops for a few seconds and then only a white screen.

Is your desktop blocking the connection? Do you have a firewall there? Are both devices connected to the same router? do you have any wifi extender?