cant connect devices to new wifi

update;  I have it working with Raku, but still get the “wrong password” for the basic connection.  

item 2:  I found a spot in the house giving me as fast as 408 Mbs, I was very pleased…. however, in an hour or so, the speed had dropped to 2.3 Mbs…  it is still there with occasional speeds to 10Mbs.  Uploads remain at 17 to 20…. how strange.  I only have a primary, no secondary and it is running band B66, and has an SNR of 4 dbm, right, 4.  that might be good for my area, but might not, I get two bars everywhere in the house …. the dbm sometimes drops to 2, maybe interference?  N radar close by, but other cell towers are as close as a mile (Verizon), but the signal goes over us, very unreliable.  that's why I am with T-

are they making changes to the towers? Mine is located located at Mission Hills, about 30 air miles and almost line of sight from my house (4000 feet above).  I guess for now I live with it… fwiw, I have anotheer connection in another house about 400 feet away and above us that regularly clocks 50-60Mbs, could it be a faulty gateway?