Unable to connect after changing AP

Have a strange problem where I cannot connect to the IoTaWatt web interface after upgrading my old Unifi AP to a TP-Link Omada WiFi 7 AP.

It seems to be still connecting, as it’s uploading data to PVOutput, but I cannot connect locally to the web interface to get live usage graphs etc.

Has anyone encountered something similar? I’d appreciate suggestions as to where to even start looking. I have re-started the IoTaWatt and AP several times, but no difference.