Stacking XGS2210-28HP

Jose_Manuel
Jose_Manuel Posts: 2
edited August 2022 in Switch
Hi all.
I´m trying to configure stacking with 2 XGS2210-28HP. Some manuals explain this procedure (https://support.zyxel.eu/hc/en-us/articles/360003664580-How-to-configure-stacking-for-switch-high-server-availability- ), but I can´t start switches in stack mode. 
This switch have 24 ports and 4 sfp+ ports. I can´t manage 2 last, 27 and 28. I undertund that port 28 would be to "open" stack, but this port don´t work. In port 26 (the last por that I can manage, stack don´t up.
Someone can I help me? How can I manage port 27 and 28?
Thank you

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