Gift cards distributed by cybersecurity company CrowdStrike to workers who helped out during a massive outage last week were flagged as possible fraud, according to a report.

The $10 UberEats gift cards were given to workers for helping during an outage that caused 8 1/2 million devices to crash last week, according to the Guardian.

CrowdStrike said the gift cards were canceled due to “high usage” after workers tried to cash in the cards and were notified they were no longer valid.

“We did send these to our teammates and partners who have been helping customers through this situation. Uber flagged it as fraud because of high usage rates,” CrowdStrike said, according to the report.

CrowdStrike issued a corrective patch 78 minutes after the initial crash, but some users had trouble updating computers that were no longer operational. They reported having to manually delete the faulty update from their computers before they were functional since the computer could no longer contact a server to receive the update.

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The computer outage caused massive flight delays and led Republicans to ask Arizona elections officials for information on how the outage could have affected voting systems in the state.

CrowdStrike posted an update Wednesday acknowledging the outage was caused by a software patch pushed to systems that caused a bug, and the company has pledged to allow customers to have more control over how and when their systems are updated and to provide more information on how and when updates are sent.