Hi… I have been fighting this same issue for months. after un-installing … re-installing and trying everything, but always the same. I could check the status of my cameras but could not arm or dis-arm no matter what… UNTILL TODAY! In fact just with-in the last 30 minutes i got it working.
No guarantee – but what I did that MIGHT have fixed it was to delete the two sync modules from my home router then letting them be found again and then renaming them with the same name used on my Alexa app on the phone. I also disabled and re-abled the skill and even then I found I MUST ask Alexia to start my blink home skill… interrupt her as she tries to tell me what I can do with the skill then ask her to ask Blink for home to …(whatever command) I find that if you do not give her the pin when disabling she might error out again but when ask in the right order it works.
Hope I helped… cause I was hitting a brick wall for a long time!