Greetings!
If you can check the running configuration ('show running-config'), you should see a command similar to the following:
ip authorized-managers 10.40.0.65 255.255.255.0 access-method snmp
What you'll need to do is either remove that line to re-enable unrestricted access to the switch:
switch(config)# no ip authorized-managers 10.40.0.65
...or modify the command to allow full access from this subnet using all access methods:
switch(config)# ip authorized-managers 10.40.0.65 255.255.255.0 access manager access-method all
For more information, refer to the ArubaOS-Switch Hardening Guide.