RSS feed not valid and not working

  • Dear all,
    i really need help
    i dont know why all of sites of my multisite wordpress get error of RSS Feed.
    i checked the validation here https://feedvalidator.org/

    my main site is ilearning.me
    to check, for example iran.ilearning.me
    iz.ilearning.me
    valent.ilearning.me
    apple.ilearning.me

    there are more than 800 sites we have and all have problem with RSS Feed, can you please let me know whats the problem?

    thanks for the help

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