I’ve tried to install Mojave to an external SSD multiple times but keep ending up with the circle with a slash through it icon instead of booting. Has anyone installed to an external SSD successfully? I have an Apple (Toshiba) OEM 128GB SSD in an external closure and have never had issues installing an OS on it before Mojave. Even reinstalled High Sierra to external then booted that version of High Sierra to upgrade. Still no luck. Installing to a Parallels image now to see if this will work for me. No way am I installing beta 1 to my internal SSD. Oh yeah, this is on a 2017 15” MBP so it should be compatible.