We have the same issue with MobileNAV whereby all working fine with iPhone 7 devices enrolled with IBM MaaS360. As soon as we upgraded to iPhone SE handsets that were on anything above iOS 14.0.1 then app opens with no content and crashes out after 10 to 15 seconds. Causing major issues now as we have had to block OS updates through the policy to keep as many users on versions previous to iOS 14.2, however, this is not ideal as iOS updates are key to the devices security.
Any update when this issue has been resolved would be greatly appreciated.