MFA on RDP Gateway. Currently we have office 365 plans that include Azure MFA for office 365. We are synced with active directory and this works well for Office 365. However we have identified that our RDP gateway server presents some risks as it is not using MFA. In researching how to use MFA on RDP gateway its seems only paid options exists. while I am not against paying for a solution everything I have found thus far is extremely expensive considering we only need it for RDP gateway MFA. We have a paid solution for office 365 already included in our plans. Azure plans that allow RDP MFA are around 6 dollars per user per month as are other third parties. As an all around solution I suppose that is reasonable but just for RDP gateway it is alot.
My question is what are others doing? Are there other options available to me I am not aware of? What do you recommend?