I’m not sure what you mean by “all lines for sales tax”
QBO does not allow for sales tax items to be used in the detail part of the invoice like desktop does.

Are the line items marked as being taxable?
Have you set up the sales tax items under taxes>sales tax?
At the […]

Resolution for 'combined item issue: 'qb does not add all lines for sales tax and don’t see tax amount on bottom of invoice' available: Yes.

The combined item 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 combined item issue yourself by looking for a resolution described in the article. If it is a complex combined item issue or you are unable to solve the issue, you may contact us by clicking here or by using other combined item support options.

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