dfrey gave kudos to Marcos in Error with Mail security license
I'd add that some products, such as ESET Dynamic Threat Defense, cannot be added to ESET PROTECT directly and must be added through the EBA portal. If you decide to purchase EDTD to improve protection against new malware on the Exchange server, please keep that on mind.
dfrey received kudos from MichalJ in Error with Mail security license
So I found out we didn't have an EBA account. So I created one and was able to add the license to it.
I figured out how to link the EBA account to ESET Protect pretty quickly (it was easy), and now it shows the license as valid. ???
Now I should be able to add the Exchange instance to ESET Protect. Well, I hope so anyway.