We started noticing issues with MS O365 services exactly as you mentioned (also SSO and so on).
Their support on these cases was just way under expectations.
After someone on their side figured this out and asked us to disable the option I went back to them and said that nowhere on the dashboard or in their documentation is a mention about the load this feature causes (it’s basically overloading the CPUs, that was the symptom that a few technicians confirmed) and that there might be issues.
I asked them to add a note and to add the info to the known bugs and as you can see, they never did that.
They also don’t give you a option to monitor the load on switches, just in case.
The support experience with this case was just rubbish, they would run captures and then say they weren’t correct and they need to do them again (a few weeks in, wasting my time numerous times). And then I would explain to them that they are not able to run proper captures, and we as well, because something is wrong.
And to sum up, most of the support experience is bad, they will tell you that the internal team has analyzed some internal logs and the switch is ok, but if you ask them to provide the logs, to show me as a proof - they would just ignore that part of the message.
