Hello user please see below:
A Stack Failed to Be Set Up
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This fault is commonly caused by the following:
-Configurations are incorrect.
-Links become faulty.
Troubleshooting Flowchart
1. Check whether a stack can be set up between these member switches.
2. Check whether the stack configuration is correct.
3. Check whether stack connections are correct.
4. Check whether ports used for stack connections are Up.
5. Check whether stack failure events occur.
https://support.huawei.com/enterprise/en/doc/EDOC1000060766/276b4991/a-stack-failed-to-be-set-up