Android devices cannot connect to the WiFi

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Hey Zyxel Team,
We are facing an issue with 3 payment terminals(Android devices).
Each device cannot connect to the WiFi: it shows "saved" beside the SSID but it doesn't connect. 
When I click on connect, it briefly shows "connecting" and then "saved".
Any recommendations, or experiences with similar issues?
I compared it with another installation with the same setup and it works.

I tried to disable/enable 2.4GHz or 5GHz to see how it reacts without success.
There are no MAC address filters.
We can connect iPads and laptops to this network but not those 3 terminals.

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