After resetting the password in Grafana using "C:\tibco\ftl\6.7\monitoring\grafana>grafana-cli --insecure --debug admin reset-admin-password test123" or

"grafana-cli --homepath "/usr/share/grafana" admin reset-admin-password <new password>"

1_First optain the correct Grafana home path using: 

ps axuf|grep grafana - to make sure we are using the correct Grafana homepath

2_Open the Grafana logs - C:\tibco\ftl\6.7\monitoring\grafana\data\log To understand why its failing

3_Please note the following:

After updating the password using grafana command, the account gets locked for 5 mins. Only after this time, you should to attempt to connect using the new password. So, after resetting the password, kindly wait for 5 min and connect again with the new password.

https://github.com/grafana/grafana/issues/30161