`subscribePresence()` fails with 404

[truenicoco]

I haven't managed to determine exactly when/why/how this happens, but this has also been reported by other users of my XMPP gateway based on skpy.
Usually when this happens, I can't subscribe to presences a few hours or days, and then I retry and it just works.
Sending and receiving message do not seem affected by this.

Account type

Old skype account now linked to a microsoft account, login via username/password

Steps to reproduce

Unfortunately, I can't reliably reproduce this issue.

Result or traceback

Traceback (most recent call last):
  File "/venv/lib/python3.9/site-packages/slidge/core/gateway.py", line 594, in _login_wrap
    status = await session.login()
  File "/venv/lib/python3.9/site-packages/slidge/plugins/skype.py", line 154, in login
    self.sk.subscribePresence()
  File "/venv/lib/python3.9/site-packages/skpy/main.py", line 96, in subscribePresence
    self.conn.endpoints["self"].subscribePresence(self.contacts)
  File "/venv/lib/python3.9/site-packages/skpy/conn.py", line 1105, in subscribePresence
    self.subscribe()
  File "/venv/lib/python3.9/site-packages/skpy/conn.py", line 1090, in subscribe
    self.conn("POST", "{0}/users/ME/endpoints/{1}/subscriptions".format(self.conn.msgsHost, self.id),
  File "/venv/lib/python3.9/site-packages/skpy/conn.py", line 237, in __call__
    raise SkypeApiException("{0} response from {1} {2}".format(resp.status_code, method, url), resp)
skpy.core.SkypeApiException: ('404 response from POST https://azwus2-client-s.gateway.messenger.live.com/v1/users/ME/endpoints/SELF/subscriptions', <Response [404]>)

[Terrance]

404 is a weird response for this as the HTTP endpoint and the SELF "endpoint" both always exist...

I'm wondering if this is a delayed case of User is in a different cloud -- usually Skype will tell you to use a specific subdomain, which SkPy has handling for but only during sign-in. I'll need to see the response headers/body for this to know what's actually going on though -- if it's an intermittent failure then you may need to leave HTTP debugging on until it happens again (no performance penalty, it's just extra print statements).

[truenicoco]

Thanks for your reply! I'll turn on debug logs then and report back.