Reply To: Catalytic surface reaction in microchannel not functioning.

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As for the many to many interface issue, you can use the following method to over the same.

Initially, remove the mesh interface and then enter the following TUI command in the console.

/define/mesh-interfaces/one-to-one-pairing? yes

Then recreate the mesh automatically.

If there is no specific requirement on creating mesh interface, I would recommend creating conformal mesh using share topology to overcome this issue.