QB Issue Resolution:

Which version of quickbooks do you have? Do you get any error while sending email.

Please check if you have already setup your email.

Go to Edit/Preferances/Send forms/Select the appropriate option.

Resolution for Issue 'Cannot log in to send e-mail invoices' available: Yes (Solved).
Source: Intuit Community forum.

Cannot log in to send e-mail invoices: 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 appropriate option
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Error Recovery for appropriate option [Canada]
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