Hi @Lita Teng
It looks like Microsoft and Akamai have a long relationship (dating back to 1999). Most likely that akamaitechnologies.com is a content delivery network backbone for Microsoft Teams.
The companies also announced that Microsoft made an approximately $15 million investment in Akamai. The goal of this strategic relationship is to help further the rapid growth of the digital media market.
This means that what you are seeing is completely normal.
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If this is helpful please accept answer.