Hi,
I'll try to help you with this issue but first I need more information about the steps you followed to reset the password. Did you change user roles through the web app or modifying the related file? Could you please share with me the link to the documentation you used to reset the password? Just to make sure there is nothing wrong with it.
Additionally, try to check out the kibana logs to see if there is any error or warning message. Please run the following commands and share with us the output if possible:
journalctl -r -xu kibana
systemctl status kibana -l
systemctl status elasticsearch -l.
With this information I may be able to help you further.