If you try to reset your password, Invisible reCAPTCHA might be missing on your password reset form.
Why this happens
Unfortunately Invisible reCAPTCHA is quite a bit more complex than the normal version of reCAPTCHA. It is nearly impossible to get Invisible to work on all forms, especially certain custom/dynamic forms that comes with some Woocommerce themes.
If you cannot get Invisible to work, then please try the normal type of reCAPTCHA as this should work most of the time with nearly all forms.
We know that this isn't ideal, but we try to make Shield work with as many different themes and configurations as possible, but we cannot get them all working, as they all are slightly different.
To learn how to change reCAPTCHA style within Shield, read the article here.