Upgrade option greyed out

REF: membership plugin (2.0.2)

I have two memberships, first membership is, guest membership, after 1 day they should be able to upgrade to the paid membership, subscription membership.

Please see attached images-

backend.jpg – shows the setup of the guest membership.

upgrade_member.jpg – this shows that the upgrade button to the subscription membership is greyed out…why? a day has passed and therefore should be able to upgrade?

I want members to be able to upgrade manually and of their own accord.

This is the last of my problems thanks for your help so far.