Trying to connect the EAP110 outdoor to the existing serial back link deco mesh indoors which works perfectly well. It's on Starlink

have the Deco app and the Tether app

Tther app doesn't recognise the device despite numerous attempts and won't join the standard extender network . Tried resetting 20+ times . Nada 

Any advice ?

I want it to behave as an access point and not an extender hence the very long Ethernet cable connectivity into the Deco mesh