Is the one week apple tv+ trial period limited?

I signed up for the 1 week trial. Downloaded the apple tv+ app to my ipad mini 4.

I started watching a couple of series via the amazon fire stick which has apple tv+ app.

After 2 episodes of The Morning Show and See I can't watch anymore episodes. I watched 1 episode of Servant. When I click on the next episode I get this message : "In app purchases not allowed on this device. To watch here you must have subscribed to apple tv+ on an Apple device".

Like I said above, I am signed up, subscribed, for the 1 week trial which is over on 22 december.

My tv set up. A sony smart tv with the amazon fire stick connected via hdmi. I live in France.

This is supposed to work here.

So I was wondering if maybe during the trial period Apple tv+ is limited to only a few shows until the week ends. When the first payment of 4.99 euros is taken, will I have access to all episodes?

thanks for any help, clarification...

I have read a bit. My fire stick is updated to most recent firmware. Not sure what else I could do.

Morris