Paste raw digits, a formatted phone number, an area code, an NPA-NXX block, or a short code. US and Canada phone lookups route automatically, and international iMessage checks are available separately.
The phone lookup database, caller ID enrichment, and report pages currently support only US and Canada NANP numbers. The value you entered does not normalize to a supported US or Canada phone number.
If you only need to check Apple iMessage registration for an international number, use /check-imessage and enter the appropriate country code.