I followed everything in Lucy’s post here and also stripped any styling / columns / divs out of the contact form as well as getting rid of…
&emailUseFieldForSubject=`1
…and it is now working. The crazy thing about this is - it’s a generic form I use on loads of sites. I’ve been through and checked those sites and it’s working on them. There are differences in that this was a brand new install of Modx 2.8.1 and PHP 7.4 with Formit 4.2.6. All other sites are still on the slightly older version of Formit and so I have to remember to go back and check those when updating Formit. Some part of the form or html wasn’t playing nicely with RecaptchaV2 and formit 4.2.6.
Here’s that link to Lucy’s solution… Formit w/Recaptcha Not Sending Email - #11 by lucy