Im using my MacBook Pro with MS teams as that how cusmtoers want to talk to me but I can share documents - can anyone tell me how to resolve this problem

I'm having problems sharing documents on my MacBook Pro using MS teams when I'm working with customers in teams meetings. Can anyone help me resolve this problem - I'm tending to join their meetings using a link in webmail to a temporary email address provided by the customer so it's effectively using their MS Teams software.

Thanks