The above is relying on 2.0.0-alpha1, and PlatformIO only supports proper release versions. Once 2.0.0 gets actually released the PlatformIO people will add the proper board definitions, framework files and other missing bits and pieces (like here or here) for proper support and it’ll work out of the box. Until then it’s all beta-stuff and custom. See my thoughts in Board Definition for Adafruit MagTag - #5 by maxgerhardt.
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