The Biden administration on Tuesday quietly launched its website for Americans to request free at-home COVID-19 tests, a day before the site was scheduled to officially go online.

The website, COVIDTests.gov, now includes a link for “every home in the US” to access an order form run by the US Postal Service. People can order four at-home tests per residential address, to be delivered by the Postal Service. It marks the latest step by President Joe Biden to address criticism of low inventory and long lines for testing during a nationwide surge in COVID-19 cases due to the omicron variant.

White House press secretary Jen Psaki said the website was in “beta testing” and operating at a “limited capacity” ahead of its official launch. The website will officially launch midmorning Wednesday, Psaki said.

There were isolated reports Tuesday afternoon of problems relating to the website’s address verification tool erroneously enforcing the four-per-household cap on apartment buildings and other multi-unit dwellings. A spokesperson for the Postal Service said in a statement that the error was “occurring in a small percentage of orders.” He said any user needing assistance could file a service request at emailus.usps.com/s/the-postal-store-inquiry or contact a help desk at 1-800-ASK-USPS.