Taxes are not calculated

Hello.

We currently have the problem that if we want to add / calculate a tax for an active subscriber. (Because he comes from another EU country and there is a different sales tax)

But the whole thing is not calculated. I add the tax rate and the field remains empty. Even if I then click on the “Recalculate” button.

In the WooCommerce settings it is also activated that taxes should be calculated. And the tax rates for the respective countries have also been added correctly. (I can also select them correctly when adding taxes)

In the product it was also configured that the standard tax rates should be used.

Unfortunately, I can’t get any further and don’t know how I could solve the problem? (The error logs also show nothing)