What does "No subscription" mean?
The student has at least one subscription, but none gives access to a group of this session (or the session has no group and no subscription has All groups). The attendance is taken anyway.
In Over plan, the owner can Add a subscription on the profile, Leave as is, or widen the Accessible groups of the subscription type (Settings > School > Subscription types). A student with no subscription at all never gets this badge.
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