Symbols or special characters disallowed (reason 351)

Your ad, keyword, or product attribute contains symbols or special characters Microsoft does not allow (Greek letters, mathematical symbols, decorative Unicode).

Microsoft Merchant Center validates titles against character limits, casing rules, and content policies — promotional language, all-caps, special characters, or keyword-stuffed titles are rejected.

1. Trim title to the channel's character limit (most: 150–200 chars).
2. Use Title Case — capitalize first letters of major words, not entire words. Remove ALL CAPS phrases.
3. Remove promotional language: 'SALE', 'Best Quality', 'Free Shipping', 'Buy Now', etc.
4. Format consistently: Brand + Model + Key Specs + Color/Size + Pack.
5. Re-submit; title updates typically propagate within 1–4 hours.

• Smart quotes from Word/Docs — Unicode chars often fail title validation
• Repeating brand name multiple times — flagged as keyword stuffing