Google announced the Android Q beta 3 at its I/O 2019 developers’ conference and confirmed that a total of 21 devices will be eligible for the beta. The list didn’t include the Pixel 3a and Pixel 3a XL, the new smartphones that Google unveiled at I/O, but it later confirmed that they would get the beta. The list has now been updated and the Pixel 3a and Pixel 3a XL have been removed.
The official page for enrolling in the Android Q beta 3 only mentions that six previous Pixel smartphones are supported. They don’t include the new handsets but the website mentions that the “Pixel 3a and Pixel 3a XL will be eligible in June.”