Hi Dear,
Handling Process
1. re-config community password by cmd below. issue not resolved.
change snmp community read_community=**** write_community=****
2. check snmp logs and find whitelist enabled.

3. SNMP server ip was not in whitelist.

Root Cause
whitelist enabled and SNMP server ip was not in whitelist.
Solution
there are two way to solve this issue:
1. disable whitelist;
2. add SNMP server ip into whitelist.

For Details check link. ---> https://support.huawei.com/enterprise/en/knowledge/EKB1100066220?idAbsPath=7919749|251366268|250389224|251366266|21538251|