this is the pool house which is only 10 to 15 meters away from my house about 7 steps away to be honest I installed two m9 plus which are working fine in the house but no signal in the pool room which is confusing the hell out of me because the m9 plus are so close to the pool room why is there no internet or reception.

If anyone could help I would be grateful as I'm lost for ideas only thing I want to avoid is connecting a Ethernet to another deco as I wanted it all wireless.

here is a pic of the back yard house you can see how close it is.