Check if the router supports mDNS (most routers support it)

Detection tool: https://wwcg.lanzouu.com/i13Al2owjkra

If the monitoring result shows support for mDNS, there is no problem.

If the displayed content is not like this, it cannot be used directly under the current router.

Known examples:

Huawei AX2 may not support it.

Other tested router models all support it.