This could have something to do with the location you are betting from. Some countries are banned, some are restricted in the types and number of markets residents can bet in. If you are using a new ISP or a VPN that is physically in one of those "undesired" countries, then you might be seeing this message.
If you believe this does not apply to you, then it's best to approach their support about it, they will be able to look at their logs and help you.