How can i force validation on the initial values in a formik form, when it mounts

Question

I am in React 16+, using withFormik for the form.

Its a single field form which on initial use will have an empty string value. I want the initial value to be validated so the user knows they must fill a value.

So blank string "" initial value, i want the error to say "please enter a value" without the user touching or anything. onload.

formik docs claim it can do this thru the built in tools, but the library/docs dont add up.

validateOnMount: https://formik.org/docs/api/withFormik#validateonmount-boolean

this value does nothing when set to true in my form. There are lots of logged issues of others having the same problems. It seems formik depreciated an old property that used to do this well. i cant find anything to do this without building some type of hack.

how can i have formik run the validation as ssoon as the from mounts.

in case your answer is to disable the "enableReinitialize" property, ive tried this in conjunction with validateOnMount: true and still get nothing.