QB Issue Resolution:

QuickBooks Online India version is not compatible to send SMS Invoice to customers at this moment. However, we will take this feedback.

Resolution for Issue 'How can I send SMS invoice to my customer?' available: Yes (Solved).
Source: Intuit Community forum.

How can I send SMS invoice to my customer?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for India version
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Error Recovery for India version [Canada]
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