Business Insurance advice?

Hi, I'm building Join Joyfully, a mental health app that gives words of encouragement and empathy on demand, and we've gotten the verbal confirmation from our first enterprise customer!

Can't say who it is, but it's a well known company.

In their Vendor Agreement, they say that we need a general liability business insurance policy for $2 million.

Anyone have advice for how we (as a software provider) can go about this in an affordable way? Do you know any good providers?