Validation check on Contact Us page?
You could try using PHP 7.0, 7.1, or 7.2 instead of 7.4
The higher the version the most likely you will find issues with some plugins. With 7.0 you should be fine, even if the oldest officially supported version is 7.4.
The higher the version the most likely you will find issues with some plugins. With 7.0 you should be fine, even if the oldest officially supported version is 7.4.