I'm not sure if this is still relevant, but I have found some references to using ADM with Samsung phones need to be unlocked with Samsung's own device manager.
I was having the same problem with ADM. I went to https://findmymobile.samsung.com and went to protect device (left hand side). I then clicked "Unlock screen". Took a minute but worked fine.
I'm not sure if this is still relevant, but I have found some references to using ADM with Samsung phones need to be unlocked with Samsung's own device manager.
Occasionally I would set up a lock screen with a 4 digit PIN. I tried that one and numerous others. I reckon I"ll just have to keep failing until the phone resets. This stinks. Thanks for all the help you guys. I'm humbled.
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