​Taxes are not generated on purchase orders, bills and adjustments.

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.