Check the fine print: Ensure the coupon code isn't expired and meets all terms and conditions.
Try a different browser or device: Sometimes switching browsers or devices can resolve the issue.
Disable browser extensions: Extensions like ad blockers can interfere with coupon codes.
Clear cookies and cache: This can help if the code isn't being recognized.
Use incognito mode: This can bypass any stored data that might be causing issues.
Contact customer service: They can verify the code and provide assistance.
Search for a new code: If all else fails, look for another valid coupon code.