This article describes how to reset the SNMP v3 user configuration to the default on an ESXi host.
VMware ESXi 8.*
To reset the SNMP v3 users configured on ESXi to their default values, execute the following command:esxcli system snmp set --users reset
The command syntax can be verified using the help option: esxcli system snmp set --help -u|--users=<str> Set up to five local users. Format is: user/-|auth-hash/-|priv-hash/model[,...] where user is 32 chars max. '-' indicates no hash. Model is one of (none|auth|priv). Use value 'reset' to set the paramter value to default.
For more details on setting up SNMP v3, refer to documentation "Configure ESXi for SNMP v3".