You might need to get a USB charger doctor and see if the output voltage is too high, one of my portable power units I have (the one I built myself) I hook up the charger doctor to it…it says 5.15vdc and it won’t charge my phone (unless I use a specific cord [odd I know]) when charging the voltage sags down to 4.97 and stays there with an approx .47A draw. Funny thing is…it will charge EVERYTHING else except my phone without that one particular cable)
The voltage starts too high and the device being charged won’t start charge because output is too high
All my other chargers start at 5vdc ± .4-.5vdc (so low is sometimes like 4.97vdc, high is 5.05vdc)