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Hi, I have a scenario that I got 200+ colleagues (research assistants) willing to collect data for our research using our App, But all the devices we have are brand new and using for only this purpose. My colleagues cannot use their personal Apple ID to sign in to the device nor to the Appstore App on the device. My Question is can they install our App via an unlisted App link, even if they are not sign in to the device or to the Appstore on the device? Thanks in Advance.

My new iPads have only the ECID, but I cannot add them to the Apple developer account's devices list. It is giving me the error "Please enter a valid Device ID". Is there a way to generate UDID from ECID / Serial Number ? Is this a bug that apple developer site has ? What should I do to add these devices so we can deliver these Apps to our clients' iPad (with ECID) ? Thanks in advance.