I am also experiencing the same problem. I've tried 3 different browsers: Safari (Version 14.0.3), Chrome (Version 90.0.4430.72), and Firefox (88.0b9). All training site pages seem to be down. I tried to access https://www.esri.com/training and it gave me a 504 Error. I also tried to access a direct link to a training module and that also gave a 504 error.
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