Back in 2018 Apple have announced the intent of disabling TLS 1.0 and 1.1 support in the beginning of March 2020
The support for TLS 1.0 and 1.1 is being dropped in iOS 13.4 and macOS 10.15.4 both of which are currently in Beta 1
Attempting to navigate to a site that is using TLS 1.0 or 1.1 on iOS 13.4 beta 1 fails
Safari cannot open the page because it could not establish a secure connection to the server
The same site can be accessed successfully with iOS 13.3.1
This can be tested by using https://badssl.com
If you have resources that require TLS 1.0 or 1.1 there is a new configuration profile in iOS 13.4 that allows legacy protocols. This is outlined in the following thread.