Invalid service parameter, Service 'SM2'

This error appears for GLS when the recipient phone number is missing or not in international format.

Requirement
Provide a valid phone number in E.164/international format: +<country code> <national number>

• No leading 0 after the country code
• Digits only (spaces/dashes allowed visually)

Examples (Hungary)

• ❌ Incorrect: 0630 111 0000
• ✅ Correct: +36 30 111 0000