How to troubleshoot migrating from an older Mac to a new one

Migration Assistant in macOS has matured to an effective and rapid way to transplant the brain of one Mac to another. I recently migrated from an M1 Mac mini to a Mac Studio using a Thunderbolt 4 cable, and nearly a terabyte of data transferred in about 90 minutes. I barely remember I’m using a new Mac except for more ports and higher performance. However, not everybody experiences this ease. One reader with a 2015-era MacBook Pro tried to

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