I would quickly check the dish alignment, but if you have not touched it, it’s probably fine. The other thing I check is the frequency error on the status page. If the oscillator is not running on the money, it might need a frequency correction on the custom page (instead of Americas). You might want to tell me how far-off your frequency is.
if your LNB is properly aligned and the frequency is correct, and you have good SNR, your receiver should lock.