A Walgreens spokesperson said they think the outage was caused by an influx of people trying to schedule an appointment, which caused the server to crash.
“We are committed to providing a seamless planning experience to achieve the shared goal of vaccinating our most vulnerable populations as soon as possible,” the spokesman said.
The outage comes as American pharmacies like Walgreens and CVS prepare for another million doses of vaccine promised by the White House last week.
To date, more than 32 million Americans have received at least one dose of a COVID-19 vaccine.
Walgreens told ABC News that they will start accepting appointments for admissions from Friday on Tuesday, prioritizing health workers, people over 65 and those with pre-existing conditions.
ABC News contributed to this report
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