Dell Latitude 7390 Touch charger question?

I have an i5 model of the 7390 (13 inch) which I bought from Dell refurbs in April, it's only used for Word so it's fine.

It comes with a power Brick that far too big to carry in a 13 inch case.
It's supposed to be able to be charged through the usb c port, which something that will fit in the case, but that's where I have a problem.

I've tried a Tecknet 65w charger.  But all I get is 'use the recommended charger' error. And, yes, it's a cheap and nasty charger, so I guess no real surprise.

I've tried a Ugreen 65w, that charges it but give the error, that it's 'slow charging' in W10. When the unit is rebooted, it gives the bios message that a 'low wattage charger' is connected?

The supplied brick charger is 65w, so why would it think a usb c 65w is a slow charger? Would it help, do you think, to try it with a 100w charger.

Anyone suggest what to try next?

Thanks...



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