Hi @ian wilson_68 ,
Based on my knowledge, we recommend that you use the publisher condition rules since all Teams app files are digitally signed. We don't recommend the use of path rules because the Teams installation directory is user-writable. We also don't recommend the use of hash rules because the rules would have to be updated each time the Teams client app is updated.
You can try to add the following to the Executable Rules & DLL Rules for the Teams client app:
Publisher: O=MICROSOFT CORPORATION, L=REDMOND, S=WASHINGTON, C=US
Product name: MICROSOFT TEAMS
Product name: MICROSOFT TEAMS UPDATE
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