This happens because Microsoft trial subscriptions can be disabled early if:
The trial exceeded the allowed usage or policy limits.
The organization converted or linked to another subscription.
Compliance or inactivity checks triggered early disablement.
Trials are sometimes disabled before expiry as part of Microsoft’s enforcement policy to prevent extended free usage beyond intended scope.
You can confirm the exact reason in Microsoft 365 Admin Center → Health → Message Center, and Look for messages related to trial expiration or enforcement policies.
If this still not explained , then please create Microsoft ticket to know the exact reason and they can review if your trial can be enabled back if something wrong happened.
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