The property 'Value' cannot be found on this object. Verify that the property exist when Installing Sitecore 9.3

If you are getting an error "The property 'Value' cannot be found on this object. Verify that the property exists" then basically what it's saying is that you have stopped your IIS and Sitecore 9.3 installation wizard is unable to start your IIS instance for the Sitecore Identity server so it can complete the installation. 

So open your Command Prompt as an Administration reset your IIS using the command below: 

iisreset

[---------- IdentityServer_StopWebsite : ManageWebsite -----------------------]

[IdentityServer_StopWebsite]:[Stop] identity.your.server.com

The property 'Value' cannot be found on this object. Verify that the property exists.

[TIME] 00:00:13

The property 'Value' cannot be found on this object. Verify that the property exists.

Cannot export non-exportable private key when Installating Sitecore 9.3

 If you are planning to use your own SSL certificate and using Sitecore 9.3 installation wizard then you must make sure that your SSL certificate is exportable when you install SSL on your server. 

Check the box so your SSL Certificate is Exportable for Sitecore 9.3 Installation

Once you make it exportable then the Sitecore 9.3 installation wizard will be able to export the certificate and continue with the installation or else you will get the following error message.

[ IdentityServerCertificates_CreateS... : NewSignedCertificate ----------------]

Cannot export non-exportable private key.

[TIME] 00:00:11

Cannot export non-exportable private key.

Unable to authenticate Azure Devops

 If you are getting an error when you are running npm install to pull changes from Azure DevOps then try to use the solution below and that should resolve the issue. 

 npm ERR! Unable to authenticate, need: Bearer authorization_uri=https://login.windows.net/6cdc5b45-d7be-4cad-9635-729e3b0a62bn6, Basic realm="https://pkgsprodcus1.pkgs.visualstudio.com/", TFS-Federated

1. Run the following command to install vsts-npm-auth

npm install -g vsts-npm-auth

2. Run the following command to fetch credentials

Run the following command:

vsts-npm-auth -config .npmrc

If it's still does not work then use the following command to forcefully refresh the token. 

vsts-npm-auth -config .npmrc -force