Issue with returning a table.

This is probably where my knowledge of accessing APIs via Power Query ends but I would've thought that something like the below would be more likely to return the format that you're expecting. (note the 'RelativePath...')

// Query2
let
  url = "https://auth.myxplor.com/api/v1/auth",
  body = "{ ""user"": ""xxxxxxxxx"",  ""password"": ""xxxxxxxxx""}",
  tokenResponse = Json.Document(
    Web.Contents(
      url,
      [Headers = [#"Content-Type" = "application/json"], Content = Text.ToBinary(body)]
    )
  ),
  data1 = tokenResponse[data],
  token = "Bearer " & data1[token],
  source = (Centreid as text) =>
    Json.Document(
      Web.Contents(
        "https://office.myxplor.com/api/enterprise/booking/center/rooms/summary",
        [
          RelativePath=Centreid,
          Headers = [
            #"x-api-key"    = "xxxxxxxxxxxxxxxxxxxxxxxxxxxx",
            Authorization   = token,
            #"Content-Type" = "application/json"
          ]
        ]
      )
    )
in
  source

Doing this with the code you provided returns an error...

Unless of course that is expected because you haven't provided actual creds to access the API, which is kind of what I'd expect you'd do. 🤔

Edit: removed sensitive info.