I wanted to check my PayPal transactions this morning and it appears the https://paypal.com.au and https://paypal.com website is not working.
This is the error message you will receive if you tried visiting the website:

This site can’t be reached
The web page at https://paypal.com.au/ might be temporarily down or it may have moved permanently to a new web address.ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY
As a workaround you must add www in the URL like https://www.paypal.com.au and you can also still visit the main website: https:/www.paypal.com and it will redirect you to https://www.paypal.com/au/home
Give that a try and see how you go. Hopefully, PayPal Australia will fix this soon. The issue seems to be related to SSL or HTTPS a protocol used for encryption and security. If you need further help have a look at this video: