I hear you, having struggled for the past months, it is tricky to get this charger working. What about VLIM? (I can’t see it on your schematic). If you don’t set VLIM to something like 2.5V or 3V the charging will not turn on.
And what do you see on VBUS? And can you see that the switching regulator is working to generate something like 8.5V?
Compare with my schematic at MP2672 VBUS oscillations - #7 by todelbru