Hello Experts,
We are trying to install a brand new on-premises Dynamics 365 CRM V9 installation. We have two servers clustered for Application and two servers configured as ALWAYS ON Database Cluster.
App Server 1: APPSRV01
App Server 2: APPSRV02
App Cluster Name: APPSRV
DB Server 1: SQLDB01
DB Server 2: SQLDB02
DB Cluster Name: SQLDB
We successfully installed Dynamics CRM v9 (Full Server Installation) on APPSRV01 pointing to the DBCluster "SQLDB" as "create new database" and the installation completed successfully. We are able to access CRM using the URL http://APPSRV01
Then we went on installing the second server (Full Server Installation) on APPSRV02 pointing to the DBCluster "SQLDB" as "connect existing". We were following the instructions we found on the link below (though it was referring to CRM 2011)
https://us.hitachi-solutions.com/blog/network-load-balancing-microsoft-dynamics-crm-2011/
During the installation there was an error "Write Lock Failed, Abort / Retry". We shutdown the APPSRV01 and pressed Retry, the installation completed. But when we tried to access CRM via URL http://APPSRV02 we are getting the "Internal Server Error - HTTP Error 500.19". Please refer following image:

Any help will be appreciated.
The main question is are we right following the above instructions to install CRM on two servers pointing to the same database? Can we achieve high availability with this setup? If yes, what have we done wrong that we are encountering this error.
The CRM on the first server is still working fine and we are able to access it using the first URL: http://APPSRV01
PS: When we tried accessing the cluster URL (http://APPSRV) we are getting error (Error 500: Internal Server Error)