You can change the hotspot a Mikrotik gateway is associated to through the dashboard as long as the Mikrotik Gateway Status is “Connected”.
If the Gateway Status says “Disconnected : Connection to the Mikrotik Failed. Check if the gateway is online.”, make sure the Mikrotik has power and is connected to the Internet.
In the dashboard, click on Hotspots> Gateways in the navigation bar to the left.
Click the edit button for the Gateway that you would like to update.
Ensure the Gateway Status is Connected.
In the ‘Select Hotspot’ drop down menu, select the hotspot you would like to move the MikroTik to and click on the blue refresh button.
Submit the form.