Downloading apps

What year and model iPad Mini do you have/own?

The “A” model number can be found on aluminium back of your iPad in small print right under the larger bold print “iPad”.

What iOS/iPadOS version is this iPad, currently, running?

Likely because your iPad is too old to support the current iPadOS version. The original iPad Mini can support iOS 9.3.5. Second and third generation iPad Mini can support iOS 12.x.