QB Issue Resolution:

I can help you with your sales tax to make sure you have each month taken care of. To start, please double check if you’ve already filed for those periods. You can do this by going to the Sales Tax menu at the top of your screen and clicking View Prior Sales Tax Returns. When you pick the Sales Tax Agency you need, it’ll show you the list of dates that have been filed.

If you have already filed for the periods you’re trying to file for, then you don’t need to do anything else. Otherwise I recommend giving a call in to our phone support team for further troubleshooting. You can reach Desktop agents at 1-877-772-9158. Pro and Premier support is available 24 hours and you can reach Enterprise support Monday to Friday between 9 a.m. and 8 p.m. EST. For your reference, here is an article that outlines Desktop support policies: https://community.intuit.com/articles/1769229

Resolution for Issue 'Sales tax report already filed prompt everytime I try to file my PST' available: Yes (Solved).
Source: Intuit Community forum.

Sales tax report already filed prompt everytime I try to file my PST: 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 file
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