Vegas Pro 14 + is still listed on Maxon's website (Red Giant's new owner or distribution partner) as being compatible with Universe. But it seems that under Maxon's regime that Universe is only available by subscription. If you have a current subscription with Maxon's Universe, you may need to contact Maxon about the problem.
Red Giant has always had a love hate relationship with Vegas Pro, (one minute they support Vegas, the next update they don't).... I don't invest further in them anymore, worst they are now under Maxon's subscription based roof.