I think there is possibility both of those prior issues were related to one or both of these issues:
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FRP (“Factory Reset Protection”) triggered: this occurs if you have a registered Google account on a device and don’t remove it before reflashing to iodéOS. If triggered, it would prevent unlocking the device again, and will prevent things like installation of apps from Aurora (“Google Play”).
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SPL (“Security Patch Level”) anti-rollback prevention: This occurs if the patch level (can be seen from “About phone”) is higher on the previous ROM before flashing. If you flash and lock immediately and don’t realize that your new install has an older SPL, then it will not boot. If you also don’t have “Allow OEM Unlocking” enabled in Developer Options before flashing, it could be a hard brick (won’t boot, can’t unlock again to reinstall).
FRP reset is now part of the installation process for FP and Pixels, I am not certain about Motorola but can check. But best to make sure you wipe out any Google Accounts as part of the “pre-install” process, and also make sure the firmware on the device is not newer than the iodéOS build (to prevent SPL rollback protection).