The leading dot describes cookie domain scope; it is not a valid response URL host for aiohttp.CookieJar.update_cookies. Normalize the response host and put the scope in the cookie Domain attribute. Leave ordinary host-scoped cookies unchanged.
diff --git a/src/aioamazondevices/http_wrapper.py b/src/aioamazondevices/http_wrapper.py
--- a/src/aioamazondevices/http_wrapper.py
+++ b/src/aioamazondevices/http_wrapper.py
@@
-from http.cookies import Morsel