App Store won’t open on iPad Pro. Running latest sw. no Wi-Fi problems. App Store window flashes and then disappears

You would be well advised to submit a Bug Report here:

Feedback - iPad - Apple

Please ensure that you include details of both your installed version of iPadOS and your iPad model in the body text of your report - and not solely rely upon the model and OS pick-list when submitting your Bug Report.

Please join others in submitting a Bug Report. Unless sufficient reports are received by Apple, the problem may not have resources assigned for a fix. You report might be the one that makes a difference:

Feedback - iPad - Apple

Please ensure that you include details of both your installed version of iPadOS and your iPad model in the body text of your report - and not solely rely upon the model and OS pick-list when submitting your Bug Report.

Are you using an iPad 2021 Pro (with M1 CPU) - or something else?

See this thread:

App store crashing issues - Apple Community

Noticed the other thread (linked above):

1. If I switch to Portrait mode (as suggested in other link / above by LotusPilot), prior to opening: App Store does launch
2. Although others reported differently, Today mode does work - it opens in TODAY mode for me
3. Did not need to use a hyperlink to store as “back door”
4. I am not on an M1 iPad

I am experiencing this problem as well.

iPad Pro, 4th Gen, 12.9 in, Model MXG22LL/A

iPad OS 15.4.1 (19E258)

App store launches (appears to), but closes immediately. Have tried connecting via WiFi and Cellular - neither work.

This problem is new - within last 7 days - for me.

Did a clean restart, and closed all other apps - this did not help.

Swapping your iPad from Landscape to Portrait screen orientation also seemingly allows the App to Launch.

I have the same problem, changed orientation as suggested and it works. Still won't work in landscape mode, weird!!

The problem appears now to have been resolved by Apple.