I've got problem too. Can't connect to the corporate wifi network with iphone 11 pro (IOS 14,3). The network is stable and working for sure (tested macbooks, other vendor laptops, android smartphones). Just facing the banner "Unable to join the network" after trusting the certificate. Tried to reset network settings, turn off "Private Address" feature. Still the same problem.
Has anybody solved this issue or faced the same scenario?