How to do Alexa authentication?

[walt22]

Hello,

I try to install Alexa on my Lyra MSC. The example has been flashed successfully and during ESP32 startup
the following messages appear on the console:

I (3062) [tls_certification]: Done setting global CA store
I (3062) auth-delegate-config: No NVS partition initialised
E (3062) [alexa]: Couldn't find valid authentication tokens. Please try resetting board to factory mode and do provisioning with companion app

It is clear, the authentication for that device in not yet done. But how to do?
Is there a description for this procedure available?

I have read, that something has to be done with Android or IoS. But under Android I found betas with some binaries.
They look to be to install on ESP. What do do with these?

On Google Play I found the app: ESP32 WiFi setup over BLE or Bluetooth Serial.
Useful for this process?

You see, I am lost. Any help is very appreciated.

Best regards
Walter