Solution found: dell Optiplex bios sata operation default is raid. Change to ahci. Got a warning message that this may affect booting,  Apply change exit bios win 11 crashes repeatedly and could not repair. try a second clean Win 11 install w sata in AHCI (there is only one sata hdd connected).  No more error at boot up.
Optiplex 9020 clean Win 11 install (bypassed check on cpu/secure boot/tpm) bios shows windows boot manager as boot device everytime power on it gives error no boot device found, press F1 to continue …press F2…press F5 press F1 will launch Win 11 without further issue. same Win 11 installation dvd used to install os in other dell desktop/laptop and did not have this weird error.  How can I get rid of it.
Optiplex 9020 Sff Win 11 clean install no boot device found