"But we want it to run on our chosen database product."
"But we want it to integrate with our single-sign on product."
"Our security team scanned it with our chosen tools and you have to fix these things before we will deploy it."
"We aren't willing to make those network changes to allow it to run."
"We won't allow it to connect to our <foobar> server but it is a requirement to connect to our <foobar> server if it is going to be hosted internally."
This is the stuff that makes "enterprise" deployments difficult. Oh and they want you to hold their hand through it but they aren't willing to pay for consulting.
I'm speaking from my experience selling both software and services to the Fortune 500. If they can cut a corner, slow pay you, try to do it themselves without paying you, etc - they will. Billions in profits but they will refuse to pay a $10K invoice just to spite you.
And in my experience you have to provide a lot of this up front BEFORE the contract is signed otherwise they won't even evaluate whether they will purchase it.
"But we want it to integrate with our single-sign on product."
"Our security team scanned it with our chosen tools and you have to fix these things before we will deploy it."
"We aren't willing to make those network changes to allow it to run."
"We won't allow it to connect to our <foobar> server but it is a requirement to connect to our <foobar> server if it is going to be hosted internally."
This is the stuff that makes "enterprise" deployments difficult. Oh and they want you to hold their hand through it but they aren't willing to pay for consulting.