Of coures they had problems getting insurance. Most have little if any motivation to seek insurance. If they tell you they have problem, the expect the requirement to go away.
If you truly want them to have insurance, you have to control that part of the transaction. Most of us found a local agency or worked through agencies like Foremost, Farm Bureau etc. and facilitated the process.
Many years back I had setup with an insurance company where they faxed me all the paperwork, I had the buyer complete it “at the closing” and collect the premium which I forwarded to the company. Every so often they would send me a $50 check per “referral” to their company. I never pursued it much but I suspect one could make a decent side business just doing that.
It has been over 10 years since I did this and to be honest I don’t even recall the name of that company or if they still have such a policy. I would not be surprised if many hear have similar type arrangements with insurance companies to put an insurance policy in place at closing (even if their is no $50 fee). Please don’t fixate on the $50 fee. I did not even know about the referral fee when I began using this company. I just liked the fact that I could handle everything right there at the time of sale. The checks came some time later.