I can confirm using the 2.0+ url was needed for me. I also am not sure if removing the org is necessary however removing and re-adding the server with a different name may work. I also wanted to add that prior to getting this working, when the device was in that "canceled' state, I was able manually upload the profile to it. I first double checked Apple Business to make sure it was showing up there properly and supervised. Then I went to the Meraki dashboard, go to Add Devices, go to iOS, and then click the blue Download button for Apple Configurator. Then from Apple Configurator I was able to right click the device I was working on and choose add - profile and upload the profile manually. Most of them just picked up and started going but one of them I had to use Apple Configurator to reboot the device to get it to the home screen.
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