add the following JVM parameter server's Generic JVM arguments, -Dcom.adobe.livecycle.crx.integration.url=http://<hostname>:<port> If it is added already, then what value it is set to?

Have you set the lc-crxintegrationurl in your server's JVM parameters in WAS console?

This is not possible, as given here: https://answers.acrobatusers.com/Trying-prevent-saving-PDF-q284121.aspxhttps://answers.acrobatusers.com/How-I-prevent-pdf-saved-q140706.aspx 

Are you using java 11? Can you try with java 8?

Since your global security is off, you are not using SSL. So, as long as you are using HTTP, you do not need to configure wc_defaulhost_secure port. It should be configured only when you want to use HTTPS?Kindly confirm if the issue is resolved now.

As per AEM Forms installation doc, the following steps are required to set the ports. Have you completed these steps? These steps are similar to the above steps, but please verify these as well. To configure WebSphere Application Server ports and aliases:1) In a web browser, type the URL to the Depl...

I can still see that lcm-lcvalidator.ear is not deployed. Did you check in WAS console > Applications > WAS enterprise application if it is deployed? Also, please check on below:Click Servers > Server Types > WebSphere Application Servers > server_name > Ports.Check the value for WC_defaulthost for ...

You need to install AEM Forms JEE server.For more details, please refer to "Install AEM Forms on JEE" section in the help guide.

I am able to reproduce the issue locally. Looks like a bug. Can you please log a Support case for this issue so that we can log a bug for the same? 

Have you saved the changes to master? After this, restart WAS server and retry the validate server step again, and share the errors generated in WAS' sysout.log and lcm.log?