Reboot both the ScreenBeam Mini 2 and your device and try the connection again.
Try removing the stored profile from the system using the following steps:
Devices > Project > Add a wireless display
Select the ScreenBeam receiver listed under Projectors heading.
Click/Tap Remove Device; select Yes to confirm.
Reconnect through Devices > Project > Add a wireless display.
Open Device Manager
View > Show Hidden Devices
Locate the ScreenBeam receiver listed under “Miracast Display Devices” category.
Right-click receiver > Uninstall
REBOOT before attempting to connect to ScreenBeam again.