There are 4 types currently -
For more details about these, check out Marketing Cloud Engagement Tenant Types.
NOTE: Tenant Types are different from Marketing Cloud Engagement Editions.
The above behavior was observed similar in both the old Stacks like S1 as well as relatively newer ones like S10.
The difference from the Core tenant type is Agency allows to add Accounts that can be treated as separate tenants
An Enterprise tenant includes multiple MIDs. A Core tenant includes a single top-level account with one MID. An Agency tenant includes only the top-level account. The difference from the Core tenant type is that the Agency tenant allows to add Accounts that can be treated as separate tenants
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