You can have an MVP even in enterprise B2B if the problem is very apparent and easy to define, and the MVP is easy to deploy.

I've created an MVP for a B2B product and have success in selling it by making it as easy as possible to deploy. This reduces the amount of stakeholders required to sign off on the product. The key is to be able to deliver value (solve a problem) without a huge man-hour investment on the customers end. After demonstrating value, I can shift the focus to a deeper integration and have more success because I have more people on my side to push it internally.