using Membership access level shortcodes

Scenario: I have a subscription plan named "Free Membership." There are two access levels: "Month One" and "Month Two."

I have wrapped some information on a page:

Some information for month two.

Some information for month one.

Now, Month One can see only the information for Month One, and that's good.

However, I would like for members who are in the "Month Two" level to be able to view both the "Month Two" information and also still be able to view "Month One" information.

I assumed it would be as simple as granting the "Month Two" access level positive permission to see the "Month One" shortcode. However...that didn't work.

What am I doing wrong?

Thank you,