Magical Discoveries - Spirit Shroud

I was under the impression that I could take Spirit Shroud with Magical Discoveries at level 6 as a Bard. I was testing this before I got to level 6 and noticed that Spirit Shroud isn't in the drop down menu on DnD Beyond.

Am I doing something wrong or is Spirit Shroud not allowed?

Extremely new to DnD, this is my 1st campaign. Any help would be greatly appreciated. Thanks!

You are 100% correct. 

I was testing on a copy and I don't own anything but it is available on my campaign.

Thanks!!