Yeah, this is actually happening more often now. Some banks are blocking specific types of transactions if they’ve seen a lot of fraud related to them.
Banks sometimes block online payments due to security checks or unusual activity, so it happens. I saw on Finance Of America customer service page on PissedConsumer that the site shows real customer reviews, payment issues, account questions and how people solved them, so I usually check it to understand what to do and how others handled similar payment or bank problems.