How do I wire a 3-way Zooz Zen21 smart switch?

[myCharlie]

The following dead-end 3-way wiring diagram shows my current setup with the Zooz Zen21, but it's not working. This wiring works fine with a simple standard paddle 3-way switch that doesn't require a neutral wire. However, since the Zooz switch requires a neutral wire, I ran a white wire from the capped neutral wire from the breaker and the light switch to the neutral slot in the Zooz, but it didn't work. Is there another way to get the Zooz switch to work? Thank you in advance.

 

[Megawatt]

The following dead-end 3-way wiring diagram shows my current setup with the Zooz Zen21, but it's not working. This wiring works fine with a simple standard paddle 3-way switch that doesn't require a neutral wire. However, since the Zooz switch requires a neutral wire, I ran a white wire from the capped neutral wire from the breaker and the light switch to the neutral slot in the Zooz, but it didn't work. Is there another way to get the Zooz switch to work? Thank you in advance.
View attachment 119134

Try switching your travelers, other than that it looks like it should work

 

[myCharlie]

Try switching your travelers, other than that it looks like it should work

To simplify everything, I ignore the second switch in the garage and just use the Zooz switch to try to turn on the light switch. I have the following wiring and it's not working. I have tried the Zooz Zen72, Zen21, and the Kasa HS200 single pole switch. All of these smart switches that requires the neutral is unable to turn the light on with the following wiring diagram.

However, if I did the same thing with the standard paddle switch but this time capped the neutral wires together since the standard paddle switch does not require a neutral wire. It works perfectly fine with this wiring.

So, what's wrong with my wiring on the smart switches? Why are all of them not able to turn the light on?

 

[Avo Mk8]

The only thing I can suggest is that perhaps the neutral wire you are running to the smart switch isn't working!
With the direct switching that works, the neutral is already provided at the light, so you're just switching the hot.
When you connect the various smart switches, if the neutral you connect to them isn't actually there, they probably won't do anything.

Do you have a multimeter to measure what's going on?

 

[myCharlie]

The only thing I can suggest is that perhaps the neutral wire you are running to the smart switch isn't working!
With the direct switching that works, the neutral is already provided at the light, so you're just switching the hot.
When you connect the various smart switches, if the neutral you connect to them isn't actually there, they probably won't do anything.

Do you have a multimeter to measure what's going on?

Yes, I do have a multimeter. What do I need to measure? When I turned on the light, there is electricity flow to the light but the light is not turn on.