Hi @Ticket
This looks like an error thrown by the server, and a 503 error usually means that the service is temporarily unavailable for maintenance or is overloaded. You can repeat the request after a delay, the length of which can be specified in the 'Retry-After' header.
Hope this helps.
If the reply is helpful, please click Accept Answer and kindly upvote it. If you have additional questions about this answer, please click Comment.