Sometimes this can be caused by ISP routing. The normal path to teams.microsoft.com is not available (for example), and it gets routed to the next closest, which is in another country. Sometimes you get actual attacks, like BGP Hijacking, to divert traffic via another country. https://news.sophos.com/en-us/2018/10/30/china-hijacking-internet-traffic-using-bgp-claim-researchers/ It is not clear from the information wether this block was correct or not, because you don't mention in what country your access to teams.microsoft.com was being served by. You would have needed to do a minimum of a traceroute at the time to check.
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