The issue likely lies in the formatting of the phone number. While “+66 (0)53 27 06 37” is a valid representation, online forms often have strict input requirements. Here’s a breakdown of why it might be considered invalid and how to fix it: Common Reasons for Invalid Phone Number Errors: - Spaces and Parentheses: The spaces and parentheses in your number might not be accepted. Forms often prefer a continuous string of digits or a specific format. - Leading Zero in Parentheses: The “(0)” might be causing a problem. Some systems expect the area code without the leading zero within the parentheses. - Incorrect Length: While the number appears correct, the system might be expecting a different number of digits. - Missing Country Code: Although you have +66, the system might not be recognizing it correctly or might require it in a different format. - Specific Format Requirements: The form might have a very specific format it’s expecting, such as no spaces, dashes instead of spaces, or a requirement for a specific number of digits in each section. How to Fix It: - Remove Spaces and Parentheses: Try entering the number as +66053270637 or 66053270637. - Remove the Leading Zero: Try +6653270637 or 6653270637. - Check the Country Code: Ensure that the “+66” is being recognized correctly. You might try removing the “+” and just using “66”. - Look for Examples: See if the form provides an example of the correct phone number format. There might be a small text box or placeholder text showing how they want the number entered. - Try Different Separators: Instead of spaces, try using dashes: +66-053-270-637 or 66-053-270-637. In your specific case, I would recommend trying the following variations: - +66053270637 - 66053270637 - +6653270637 - 6653270637 If none of these work, carefully examine the form for any specific instructions or examples regarding the phone number format. Let me know if you’re still having trouble after trying these options!