Hi Support,
Test environment: https://staging01.contactform7.testdirect.nl/
Contact Form 7 form with a Date field picker not submitting on Internet Explorer. The error message below is displayed in the console:
SCRIPT5022: Exception thrown and not caught
wp-polyfill-fetch.min.js (1,489)
If you change Wordpress theme to, for example, Twenty Twenty-One, you can submit the form without any problems.