Sounds like the low pressure switch / sensor is not satisfied . I do not know what it is set at ?
Now , what I try to do is to is vacuum the system & then charge , by weight , with liquid , from a large jug of R134a ( purchased at Sam's club ) .
This fills with liquid , initially . When it starts evaporating inside the system . Raising the pressure .
Something else you might do is warm the small can of R134a , to raise the pressure .
God bless
Wyr
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