How do you register alexa to make calls and send messaes to other alexa users?

Just ask Alexa to make the call through your Echo device. Say "Alexa, call [name of contact]," and Alexa places the call. To make a call with the Alexa app on your phone, make sure you're at the Communicate screen. Tap the Call icon and then select the contact you want to call.

Your Alexa-enabled device doesn't connect to your Fire TV. Make sure that your Alexa-enabled device and Fire TV are registered to same account. Check that your Alexa-enabled device and Fire TV are on the same Wi-Fi network. Make sure that your Fire TV and Alexa app have the latest software version.

Many Reason For Smart Device Alexa Speaker not working Such as
Alexa In Mute Mode: In that situation, Alexa Smart Speaker flashes with a Red ring and Show as the Alexa Red Ring problem, Then Firstly will need to check the mute Button and solve the Alexa not working problem.
Alexa not connecting with Wireless network: In such a situation, Alexa won't connect to WiFi problem, Then you need to connect the WiFi device and solve the Alexa Offline problem.
Not using the Wake Words: Sometime user will face the Alexa not Responding problem and Alexa behaves as not working mode. Then you will need to Solve the Alexa speaker unresponsive problem.
Alexa not kept in a good place: You will keep the smart speaker Alexa setup in the right place where WiFi connectivity range is available i.e near to the WiFi router.
Alexa setup Device not compatible working with Adaptor: Many users always have these faults created with connecting the Alexa Adaptor with not compatible.
Make sure Alexa's working situation: Ensure the Alexa Setup working situation condition, it may be not faulty.
These are the above condition fulfilled then your Alexa become working mode.

We know Alexa is the most popular and famous smart speaker device. But sometime many user facing the Alexa issues as follow
Alexa is Offline issues
Alexa Won't connect to Wi-Fi problem
Alexa registration Failure issues
Alexa not responding issues
Alexa Ring Light Issues
How To Set Up Alexa
And many other issues also arise during the Alexa connectivity with home smart device
Alexa installation
Alexa update
Alexa not working
Alexa not show light
Alexa not say anything
When these issues arise then you need to solve them by the latest method. So contact us and get the best solution!

Solutions For The Echo Registration Failure Error
First you have needs to Reboot the Echo dot and Reboot the Wi-Fi router
Because many Echo Alexa problems are resolved by just one reboot of the Alexa and router device.
After that do, then still registration error then you can deregister your Alexa Echo device
After again register your device
Keep same ID password during register the Alexa Echo device
Used the updated latest version Alexa App
Make sure used the same Wi-fi with same user passwords network
If Echo registration Failure Error still exists then you can contact us toll-free number +1-817-464-8883 and get the instant solutions.

It means your device is locked from registration by Amazon. Either it's considered stolen or a return in transit. You will need to call amazon customer service and have then connect to echo team. That's how I had it resolved. I had a return that I decided to keep - but when initially requested a return, it was deactivated by them.

you have to change the msg center no which is avillable from the oparator