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I faollowed the instructions to make Acrobat the default PDF app in Teams and it never worked. I have another Business tennant (E3) that I set it up on and it worked without issues. Then I found an interesting item at the bottom of a Microsoft KB article (https://learn.microsoft.com/en-us/microsoftteams/adobe-acrobat-pdf-viewer-teams) and the very last bullet point states:
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