Tax amount is not shown, Error "Inclusief btw undefined"

Please check and adjust as the website is currently in production! I will let you know when production is finished and you can look into the problem.

The new website is called: www.uwonlinedierenvoeding.nl

We are now in production with the website!

No amount VAT is shown on the Administrator site of Easystore on the output to the client!!

This webshop is now in production because the customer can't wait any longer and because his old webshop doesn't work anymore!
We still have problems and now there is another error with the VAT.
I have executed the assignment! But now there is no VAT text and VAT amount visible at all!
In the Netherlands it is mandatory to have VAT amounts on overviews!

Invoice:
https://imgur.com/a/PJnLQU5

Order Summary:

https://imgur.com/a/PJnLQU5

I Have the same Problems. taxes are in products. Frontend and checkout shows tax.
Problem is only in the admin area.

The problem is still that the text "Include tax" and the amount is not showing ad the admin area!

Invoice:

https://imgur.com/a/SfiGFF1

Order:

https://imgur.com/a/ZxtSDZ9

Add the Backend not tax is showing, must be like this;

Under the amount from the product, that's include TAX no specificatie of the TAX under the amout.
Like this

Product 2,00 euro
(inclusief BTW 0.56)