Yes, Here’s why:
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Current limit: The free Okta Developer Edition now has a 100 monthly active user (MAU) limit.
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Your situation: With 1300+ users, you’ve exceeded this limit.
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Error messages: The API error and disabled “Add Person” button confirm you’ve hit the limit.
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Legacy accounts: If you had an older account, you might have been granted a 15,000 MAU limit, but you’ve likely exceeded this as well.
Reference: Developer Plan Changes FAQ