If this is a company printer, do not attempt to reset it yourself. Your IT department likely set a specific security policy. Contact them for the credentials.
On newer firmware versions or after a partial reset, the default password may revert to the device's Serial Number Network Reset:
Leaving the default password as "Admin" leaves your printer vulnerable to unauthorized access, data scraping, or remote tampering over the network.
Kyocera M3550idn Default Password Fix Review
If this is a company printer, do not attempt to reset it yourself. Your IT department likely set a specific security policy. Contact them for the credentials.
On newer firmware versions or after a partial reset, the default password may revert to the device's Serial Number Network Reset: kyocera m3550idn default password
Leaving the default password as "Admin" leaves your printer vulnerable to unauthorized access, data scraping, or remote tampering over the network. If this is a company printer, do not