Can Not verify domain because Unusual Activity Detected from this IP, try again later after sometime."

Can Not verify domain because Unusual Activity Detected from this IP, try again later after sometime."

Hi, I was verifying the domain, and it seems the DNS was not yet propagated, so I tried multiple times to verify, then I got the message "Unusual Activity Detected from this IP, try again later after sometime."
And when I wait and try again later to verify the domain I get the same message!

Please help.

Thanks