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Thank you for posting here in the Community, @cjakubow.
You can no longer re-enable the Automated Sales tax, once you already switch to the old version. As of the moment, you can use the old version of the Sales tax.
For future reference on how to record, adjust and delete manual sales tax payments in the Sales Tax Center, please check these great articles:
I'm always here to help you out if you have other concerns. Have a nice day ahead!
Another option for AST fililing and reporting
Hope it helps.