We're on the test stage of our Mobile Push implementation. We are using setContactKey and Delay Registration Until Contact Key is Set method, and this way, all of our contact's devices are having contact key related to them.
But the thing is, we'ld also like to send push notifications to our customers who didn't login. Without login, I believe that the device will not have a contact key, and Marketing Cloud will delay the registration.
We are using Salesforce ID as Contact Key, which starts with 0034J0, so I've created a filtered list to see the devices without login(Contact key not contains 0034j0 and device id is not null), but I'm not able to see the devices.
Has anyone faced this issue before? How can we manage to send push notifications to users that did not login, just opened our app without login?