Looking for assistance on how to resolve this issue. Seems like one issue just lead to others. I configured this switch with a script I placed in the flash and everything worked out fine; my username/password was in there, encryption, configs, etc. iOS is also in the flash so reloading the switch sources it from there. To test that the configs stuck I reloaded the switch twice. The first time everything looked good but the second time my configs were completely erased.
Upon researching I discovered the switch had this in the "show version:"
Configuration register is 0x142 (will be 0x102 at next reload)
I applied the configs (see below) that seemed to work with the 3650s hoping it would work with the c9200:
no system ignore startupconfig switch all
Then after the reload, switch boots up fine and asks for me to press return so I can login with username and password. At this point is where I am given the "Authentication Failure" and the username option does not show. I push enter again and it does the same thing over and over; no way for me to login to my switch. I am thinking I may need to clear/delete the startup/running config or restore default settings. I am new to this switch and would appreciate any help. I think I go into Ronmon correctly but I don't know the commands to clear the startup/running configs or restore to default.
Thank you everyone for the feedback. Turns out after the reboot the "Authentication Failure" would happen if you immediately press enter after the reload. After giving it more time and pressing enter, the login prompt for username/password would then allow me to login and I did. Configs also stuck.