Problems with Alexa

Hi everyone, I have some problem with Alexa.
Having an Echo Dot 4, I installed via hacs the alexa media player integration and then use a package created by DomHouse.it to listen to some radio stations on Alexa.
I followed the related tutorial and at the end of the work I have on HA the card with possibility to choose the radio station, rather than Spotify playlist etc.
The only problem is that HA show me Alexa as “Unaviable” or in “Standby” but in any case, clicking on the play button on the card I do not listen to anything.
Another problem I have, again with Alexa, is the possibility to turn on/off some devices flashed with tasmota, which are perfectly recognized and integrated with HA; I give an example, I have a T1 Sonoff flashed with tasmota that I called “studio” and that I can safely control from the HA switch card and that I can control with Google Nest Mini; if, however, I say “Alexa turn on studio” I get the answer “on the studio device this function is not available”.
The same is true with other devices, again perfectly controllable by HA and/or Google Nest Mini, but for which Alexa tells me “Unfortunately, I could not find any group or device called …”.
Other devices, also tasmota, on the other hand I am able to control via Alexa.
I forgot tell you that for integrate both voice assistants (Alexa and Google) I use the nabucasa cloud.
Consider again that a few weeks ago, in my thousands of trials done, instead I was able to use Alexa both as a radio and to turn on turn off all the devices.
Could it be that there is the smartphone alexa app messed up?
Hello and thank you

Which tutorial? Which card? You need to show us specifically how you are trying to have the button tell Alexa to play the radio station.

The normal resting state for a media player created by the Alexa Media Player custom component is “Standby”. If your Alexa device’s state is “Unavailable” that means you either have a configuration issue or a problem with the connection to Amazon’s servers.

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THIS IS the tutorial that I followed for lissen the radio on Alexa.
This is the card that was created for the scope and, how you can see, Alexa is UNAVAILABLE

.
I attach also a screenshot of the integration of Alexa Media Palyer where the stato of devise is UNAIVAILABLE (in italian NON DISPONIBILE).

There is a way for reset (delete) the integration of Alexa with HA and to proceed with a new installation?
It’s possible that the iusse is with Nabucasa Cloud?
Thanks