Android SMS not receiving

I try to setup a sms automation for my client with Make. We downloaded the unrestricted version of Make. Allowed SMS in both app & device, yet it still doesn’t work.

We have been struggling with this for more than a month now. Tried 3 device and it only worked on mine but not on my clients’. All the devices we tried with were Samsungs.

Did anyone encounter a problem like this and managed to solve? We contacted support but didn’t hear back from them.