You cannot "scan in" at Disney California Adventure, you must be at Disneyland
Though Disneyland Park and Disney California Adventure are right next to each other, guests hoping to avoid the morning crowds may try and join a boarding group from Disney California Adventure. However, Disney has confirmed that you must be in Disneyland Park in order to join a boarding group, and you will not be able to join the virtual queue from across the esplanade.
Guests staying at a Disneyland Resort Hotel may have a slight advantage
Though Boarding groups will be released at park opening for everyone, if you are staying at a Disneyland resort and can take advantage of the Magic Morning early entry amenity, you might have a little bit of an advantage, as you'll already be in the park, and won't have to wait in line to scan in to the park.If you're ready to go exactly when the park opens, you'll have the best chance of getting a boarding group with a low number, so you'll be able to get on the ride faster!
Though Star Wars: Rise of the Resistance has had its share of technical issues and hiccups on the East Coast, the West Coast has had extra time to prepare themselves for the launch of this new attraction, and have even had Cast Member previews over the past few days, which will hopefully help keep this attraction running smoothly during its first weeks open.