polarisation problem

Unusual footprints on that satellite. See https://www.lyngsat-maps.com/abs1.html

But I have to start by asking you to restate which band you're attempting to receive. I only see what appears to be C-band (A & B footprints) and Ku-band (north and south footprints). Ku-band polarization appears to be vertical-north/horizontal south.

If you in fact are talking about ABS1 Ku-band North, note the dish size chart to the right of the footprint diagram on https://www.lyngsat-maps.com/maps/abs1_north.html. A six foot dish (1.8m) may not be sufficient at 23 degrees north longitude.

Another possibility is that your LNB does not have a dual (polarization) output. You may simply have to rotate it 90 degrees to intercept vertical signals.

//greg//

Generally accepted microwave bands:
L band       1 to 2 GHz
S band       2 to 4 GHz
C band       4 to 8 GHz
X band       8 to 12 GHz
Ku band       12 to 18 GHz
K band       18 to 26.5 GHz
Ka band       26.5 to 40 GHz
Q band       30 to 50 GHz
U band       40 to 60 GHz
V band       50 to 75 GHz
E band       60 to 90 GHz
W band       75 to 110 GHz
F band       90 to 140 GHz
D band       110 to 170 GHz (Hot)

Before attempting anything with the dish, you might want to check the signal from the indoor receiver that changes the LNB output from horizontal to vertical.

If the receiver is sending the correct control signals, suspect the LNB

//greg//