enable snmp v3

R2(config)#snmp-server group group1 v3 auth

R2(config)#snmp-server user user1 group1 v3 auth md5 pass1234

-pass min 8 characters
PRTG for Windows Settings
R2#sh snmp user
User name: user1
Engine ID: 800000090300C2012DE40000
storage-type: nonvolatile        active
Authentication Protocol: MD5
Privacy Protocol: None
Group-name: group1
R2#sh snmp group
groupname: group1                           security model:v3 auth
readview : v1default                        writeview: <no writeview specified>
notifyview: <no notifyview specified>
row status: active
R2#sh run | inclu snmp
snmp-server group group1 v3 auth

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