>>65615what's your email address tld? not the whole email, just the tld (the .com in google.com is called tld, kemono's tlds are .party and .cr if you're wondering)
because it's a common problem that most services/sites would refuse any email addresses which dont end with .com, .net, or .org tld
kinda unrelated but to assert why .com tld matters, is that for this reason why tuta.com from tutanota is a paid feature while tuta.io is the free one