I got a error "Unusual activity detected from this IP. Please try again after some time", when I click verify DKIM.

I got a error "Unusual activity detected from this IP. Please try again after some time", when I click verify DKIM.

I already setup DKIM TXT record. And already got a result from 3rd part website.
But when I go back to Zoho and verify the DKIM, I got "Unusual activity detected from this IP. Please try again after some time".

So what can I do now?