"What certbot requires" is exactly what it told you it requires: a TXT record for _acme-challenge.emeeting.myatbu.com with the contents of RfloBvXXXXXXXXXXXXXXXXXGy2s. Why didn't you do that? Instead, you had a TXT record for the same domain with your SPF record, which is almost certainly incorrect for SPF, and it's most definitely incorrect for Let's Encrypt. You don't need to delete the existing TXT record in order to create the one Let's Encrypt wants (though you should, as it isn't doing anything useful); just create another one with the correct value. Note that "the correct value" will be different the next time you run certbot.
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