Start by checking whether the problem affects everyone or only some users.
If everyone is affected:
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Open the Moodiy client portal and check the subscription status and alerts.
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Check whether the service is suspended, waiting for payment, scheduled for termination, pending setup, pending downgrade or upgrade, or under scheduled/ongoing maintenance.
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If you use a custom domain, verify that DNS is still configured correctly.
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Try the original Moodiy subdomain if it is still available.
If only some users are affected:
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Confirm their Moodle username or email is correct.
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Ask them to reset their Moodle password.
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Check whether their Moodle account is suspended, deleted, or not enrolled.
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Confirm the course enrolment and role are correct.
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Ask them to try another browser or network.
If the issue continues, contact support with the site URL, affected users, error message, and when it started.