If you install the machine based teams installer, it adds this to the registry: value name = TeamsMachineInstaller, value data = %ProgramFiles%Teams InstallerTeams.exe --checkInstall --source=default to ComputerHKEY_LOCAL_MACHINESOFTWAREWOW6432NodeMicrosoftWindowsCurrentVersionRun. That causes an entry just called "Program" under the Task Manager Startup tab. It would be helpful if Teams could be properly identified under the Task Manager Startup tab instead of just "Program".
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Agreed! I've noticed this on a few machines, and it's quite unnerving to see "Program" listed there.
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@MelQL Thank you for reaching out and helping improve MS Docs. I'll have the team look into this.
@MelQL - thank you for submitting feedback.
I think the best way forward is if you open a service ticket in your tenant so this can get resolved ASAP. Based on the outcome let me know if it is something that can be called out in the docs.
Please follow this link to contact support for business products: https://docs.microsoft.com/office365/admin/contact-support-for-business-products
Please keep us posted here on the resolution so we can feed whatever information you discover into the content.
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Any update on this? I'm not able to escalate this as a tenant because I don't have tenant access. Seems like an issue with the installer, not a tenant-specific issue. It's a bit sloppy for the teams installer to be leaving this behind. Also, the path it leaves is not even valid because the files referenced no longer exist
I just found this on daughters PC. It's still there. It's hard not to say bad things about MS...
edit:
OMG... it makes it look like its in "C:Program FilesTeam...." But if you look close it shows "C:Program"FilesTeam....
Who knows whats really going on except wasting my time finding out!
Oh, it's MS so it's perfectly fine/safe....
I was about to submit my own issue but will add my contribution to this thread:

Is this a valid Start up entry for Microsoft Teams seems a little odd to me? Especially the misplaced " in the path.
Additionally its targeting the wrong program files folder, when I look on disk its located in the (x86) folder:

Adding the Command line column in Task Manager finally gave me a bit of peace of mind that this was a legitimate "Program" but it would certainly be nice to have this fixed. Really wondering how this happened with a Microsoft application.
I found how to correct this manually so it appears correctly in the Startup tab. Just change the reg entry in HKLMSOFTWAREWOW6432NodeMicrosoftWindowsCurrentVersionRun
from: %ProgramFiles%Teams InstallerTeams.exe --checkInstall --source=PROPLUS
to: %ProgramFiles(x86)%Teams InstallerTeams.exe --checkInstall --source=PROPLUS
I have this and I never even purposefully downloaded Teams, I think my other office products tried to do it for me.
I just found this issue on my machine with Windows + O365 C2R Office installed in September 2020 and with a Teams installer dating back to August 2020. When changing the registry entry to the correct path, the "Program" is listed as "Teams". Strange that this issue is more than a year old, but no progress has been made on resolving it.
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Adding the Command line column in Task Manager finally gave me a bit of peace of mind that this was a legitimate "Program" but it would certainly be nice to have this fixed. Really wondering how this happened with a Microsoft application.
I found how to correct this manually so it appears correctly in the Startup tab. Just change the reg entry in HKLMSOFTWAREWOW6432NodeMicrosoftWindowsCurrentVersionRun
from: %ProgramFiles%Teams InstallerTeams.exe --checkInstall --source=PROPLUS
to: %ProgramFiles(x86)%Teams InstallerTeams.exe --checkInstall --source=PROPLUS