Alexa configuration

i have many problems to RE integrate "alexa media player "… always the message : 500 Internal Server Error Server got itself in trouble (like many persons)

i have the addon DuckDns so my url is:

several people advise me to install “NGINX Home Assistant SSL proxy” in addition to DuckDns to resolve my problem

how to do it and is it essential to connect to the alexa server

other question:
can I restore a ha backup(snapshot) in which the alexa media player configuration worked??