How do I convince IT to help me deploy PRM?

This is not usually the IT department’s decision. PRM is a strategic platform and the decision to deploy is usually a C-level responsibility. If your IT department does have decision-making power, you’d want to demonstrate to them that your channel partners are the greatest source of revenue and income for your company, and you need PRM to manage them most effectively. This becomes moot if your PRM is cloud-hosted. Then your IT department would be foolish not to participate so they can maintain some semblence of compliance with their security and other requirements.