Anyone else having Teams meeting issues in Sydney?

There are similar reports from Perth, Victoria, Queensland and the ACT, as well as New Zealand and Japan. It doesn't sound limited to Sydney, though the symptoms seem to vary.

Meeting joins seem particularly unreliable. Some people report timeouts or a message that meetings are temporarily unavailable, while one-to-one calls can be slow to connect or work only intermittently. Other parts of Teams may still work.

Check Microsoft 365 Service Health for incident TM1437780. There were reports that Microsoft was investigating, although the update was described as vague. Service Health may also lag behind what users are seeing.

Some calls were reported working again, but that doesn't necessarily mean the issue is fully resolved. Retest both a meeting and a one-to-one call before treating it as fixed.

Joining isn't always a clean success or failure either. One report described people ending up in what looked like empty calls while others couldn't join at all, so it may help to confirm participants can actually hear each other.