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Yes, networks are all locked down, needs IT support to add anything, hardware or software. We have tried just using mobile phone cameras on TEAMS but picture quality isn't fantastic especially for detail and a bit clunky in use eg phone user has to switch to sharing their screen, they start with an image up their nose, then have to switch cameras etc. I'd rather have one dedicated camera which the meeting leader controls from the PC.
Something like DroidCam which lets you use a mobile phone as a webcam via wifi seems an easy option. There's a variety of different ones out there.
EDIT: but might be an issue if you can't add devices to the network.