We are currently in version 2022 R2. Tax Category, Taxes Zone, and Taxes have all been set up.  We implemented in a Canadian branch, which is why we are adding a GST tax. However, the tax is not generating on POs and APs. 

I have found a post, but our situation is the opposite. @Laura02   helped me out a lot to check and she was unable to get tax to appear on a PO in 2022 R2, which is the same version we are using at the moment. 
Purchase orders getting issued with tax - despite vendor being Tax Exempt

Could this be a version issue? The PO and Bills and Adjustments are not generating a tax? 

Is there anyone else experiencing the same problem.